diff --git a/backend/services/docker-compose.yml b/backend/services/docker-compose.yml
index 8083fd12..a75a776b 100644
--- a/backend/services/docker-compose.yml
+++ b/backend/services/docker-compose.yml
@@ -273,6 +273,14 @@ services:
       - WALLET_SERVICE_URL=http://rwa-wallet-service:3001
       - IDENTITY_SERVICE_URL=http://rwa-identity-service:3000
       - REFERRAL_SERVICE_URL=http://rwa-referral-service:3004
+      # MinIO Object Storage - 用于合同签名和PDF存储
+      - MINIO_ENDPOINT=${MINIO_ENDPOINT:-192.168.1.100}
+      - MINIO_PORT=${MINIO_PORT:-9000}
+      - MINIO_USE_SSL=${MINIO_USE_SSL:-false}
+      - MINIO_ACCESS_KEY=${MINIO_ACCESS_KEY:-admin}
+      - MINIO_SECRET_KEY=${MINIO_SECRET_KEY:-minio_secret_password}
+      - MINIO_BUCKET_CONTRACTS=${MINIO_BUCKET_CONTRACTS:-contracts}
+      - MINIO_PUBLIC_URL=${MINIO_PUBLIC_URL:-https://minio.szaiai.com}
     depends_on:
       postgres:
         condition: service_healthy
diff --git a/backend/services/planting-service/package-lock.json b/backend/services/planting-service/package-lock.json
index a1ea0b8e..2a4dbf63 100644
--- a/backend/services/planting-service/package-lock.json
+++ b/backend/services/planting-service/package-lock.json
@@ -25,6 +25,7 @@
         "class-validator": "^0.14.0",
         "jsonwebtoken": "^9.0.0",
         "kafkajs": "^2.2.4",
+        "minio": "^8.0.6",
         "passport": "^0.7.0",
         "passport-jwt": "^4.0.1",
         "pdf-lib": "^1.17.1",
@@ -39,6 +40,7 @@
         "@types/express": "^4.17.17",
         "@types/jest": "^29.5.2",
         "@types/jsonwebtoken": "^9.0.0",
+        "@types/minio": "^7.1.0",
         "@types/node": "^20.3.1",
         "@types/passport-jwt": "^4.0.0",
         "@types/supertest": "^2.0.12",
@@ -2573,6 +2575,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/minio": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@types/minio/-/minio-7.1.0.tgz",
+      "integrity": "sha512-yUaFE62KI7lhQLH7lQpT1bzDmTOS+8bD7wGN8ySk8teLv9afbL7RIT3tSbeijq6sqeyS9kGpj9Kmp4gHNQJWCw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/ms": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/@types/ms/-/ms-2.1.0.tgz",
@@ -3117,6 +3129,13 @@
       "dev": true,
       "license": "Apache-2.0"
     },
+    "node_modules/@zxing/text-encoding": {
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/@zxing/text-encoding/-/text-encoding-0.9.0.tgz",
+      "integrity": "sha512-U/4aVJ2mxI0aDNI8Uq0wEhMgY+u4CNtEb0om3+y3+niDAsoTCOB33UF0sxpzqzdqXLqmvc+vZyAt4O8pPdfkwA==",
+      "license": "(Unlicense OR Apache-2.0)",
+      "optional": true
+    },
     "node_modules/accepts": {
       "version": "1.3.8",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
@@ -3369,12 +3388,33 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/async": {
+      "version": "3.2.6",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.6.tgz",
+      "integrity": "sha512-htCUDlxyyCLMgaM3xXg0C0LW2xqfuQ6p05pCEIsXuyQ+a1koYKTuBMzRNwmybfLgvJDMd0r1LTn4+E0Ti6C2AA==",
+      "license": "MIT"
+    },
     "node_modules/asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
       "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
       "license": "MIT"
     },
+    "node_modules/available-typed-arrays": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.7.tgz",
+      "integrity": "sha512-wvUjBtSGN7+7SjNpq/9M2Tg350UZD3q62IFZLbRAR1bSMlCo1ZaeW+BJ+D090e4hIIZLBcTDWe4Mh4jvUDajzQ==",
+      "license": "MIT",
+      "dependencies": {
+        "possible-typed-array-names": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/axios": {
       "version": "1.13.2",
       "resolved": "https://registry.npmjs.org/axios/-/axios-1.13.2.tgz",
@@ -3576,6 +3616,15 @@
         "readable-stream": "^3.4.0"
       }
     },
+    "node_modules/block-stream2": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/block-stream2/-/block-stream2-2.1.0.tgz",
+      "integrity": "sha512-suhjmLI57Ewpmq00qaygS8UgEq2ly2PCItenIyhMqVjo4t4pGzqMvfgJuX8iWTeSDdfSSqS6j38fL4ToNL7Pfg==",
+      "license": "MIT",
+      "dependencies": {
+        "readable-stream": "^3.4.0"
+      }
+    },
     "node_modules/body-parser": {
       "version": "1.20.3",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.3.tgz",
@@ -3638,6 +3687,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/browser-or-node": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/browser-or-node/-/browser-or-node-2.1.1.tgz",
+      "integrity": "sha512-8CVjaLJGuSKMVTxJ2DpBl5XnlNDiT4cQFeuCJJrvJmts9YrTZDizTX7PjC2s6W4x+MBGZeEY6dGMrF04/6Hgqg==",
+      "license": "MIT"
+    },
     "node_modules/browserslist": {
       "version": "4.28.0",
       "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.28.0.tgz",
@@ -3721,6 +3776,15 @@
         "ieee754": "^1.1.13"
       }
     },
+    "node_modules/buffer-crc32": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-1.0.0.tgz",
+      "integrity": "sha512-Db1SbgBS/fg/392AblrMJk97KggmvYhr4pB5ZIMTWtaivCPMWLkmb7m21cJvpvgK+J3nsU2CmmixNBZx4vFj/w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8.0.0"
+      }
+    },
     "node_modules/buffer-equal-constant-time": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
@@ -3757,7 +3821,6 @@
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.8.tgz",
       "integrity": "sha512-oKlSFMcMwpUg2ednkhQ454wfWiU/ul3CkJe/PEHcTKuiX6RpbehUiFMXu13HalGZxfUwCQzZG747YXBn1im9ww==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "call-bind-apply-helpers": "^1.0.0",
@@ -4328,6 +4391,15 @@
         }
       }
     },
+    "node_modules/decode-uri-component": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.2.tgz",
+      "integrity": "sha512-FqUYQ+8o158GyGTrMFJms9qh3CqTKvAqgqsTnkLI8sKu0028orqBhxNMFkFen0zGyg6epACD32pjVk58ngIErQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10"
+      }
+    },
     "node_modules/dedent": {
       "version": "1.7.0",
       "resolved": "https://registry.npmjs.org/dedent/-/dedent-1.7.0.tgz",
@@ -4377,7 +4449,6 @@
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/define-data-property/-/define-data-property-1.1.4.tgz",
       "integrity": "sha512-rBMvIzlpA8v6E+SJZoo++HAYqsLrkg7MSfIinMPFhmkorw7X+dOXVJQs+QT69zGkzMyfDnIMN2Wid1+NbL3T+A==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "es-define-property": "^1.0.0",
@@ -4965,6 +5036,12 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/eventemitter3": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-5.0.1.tgz",
+      "integrity": "sha512-GWkBvjiSZK87ELrYOSESUYeVIc9mvLLf/nXalMOS5dYrgZq9o5OVkbZAVM06CVxYsCwH9BDZFPlQTlPA1j4ahA==",
+      "license": "MIT"
+    },
     "node_modules/events": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/events/-/events-3.3.0.tgz",
@@ -5165,6 +5242,24 @@
       "integrity": "sha512-W+KJc2dmILlPplD/H4K9l9LcAHAfPtP6BY84uVLXQ6Evcz9Lcg33Y2z1IVblT6xdY54PXYVHEv+0Wpq8Io6zkA==",
       "license": "MIT"
     },
+    "node_modules/fast-xml-parser": {
+      "version": "4.5.3",
+      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-4.5.3.tgz",
+      "integrity": "sha512-RKihhV+SHsIUGXObeVy9AXiBbFwkVk7Syp8XgwN5U3JV416+Gwp/GO9i0JYKmikykgz/UHRrrV4ROuZEo/T0ig==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "strnum": "^1.1.1"
+      },
+      "bin": {
+        "fxparser": "src/cli/cli.js"
+      }
+    },
     "node_modules/fastq": {
       "version": "1.19.1",
       "resolved": "https://registry.npmjs.org/fastq/-/fastq-1.19.1.tgz",
@@ -5261,6 +5356,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/filter-obj": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/filter-obj/-/filter-obj-1.1.0.tgz",
+      "integrity": "sha512-8rXg1ZnX7xzy2NGDVkBVaAy+lSlPNwad13BtgSlLuxfIslyt5Vg64U7tFcCt4WS1R0hvtnQybT/IyCkGZ3DpXQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/finalhandler": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.3.1.tgz",
@@ -5353,6 +5457,21 @@
         }
       }
     },
+    "node_modules/for-each": {
+      "version": "0.3.5",
+      "resolved": "https://registry.npmjs.org/for-each/-/for-each-0.3.5.tgz",
+      "integrity": "sha512-dKx12eRCVIzqCxFGplyFKJMPvLEWgmNtUrpTiJIR5u97zEhRG8ySrtboPHZXx7daLxQVrl643cTzbab2tkQjxg==",
+      "license": "MIT",
+      "dependencies": {
+        "is-callable": "^1.2.7"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/foreground-child": {
       "version": "3.3.1",
       "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.3.1.tgz",
@@ -5526,6 +5645,15 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/generator-function": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/generator-function/-/generator-function-2.0.1.tgz",
+      "integrity": "sha512-SFdFmIJi+ybC0vjlHN0ZGVGHc3lgE0DxPAT0djjVg+kjOnSqclqmj0KQ7ykTOLP6YxoqOvuAODGdcHJn+43q3g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/gensync": {
       "version": "1.0.0-beta.2",
       "resolved": "https://registry.npmjs.org/gensync/-/gensync-1.0.0-beta.2.tgz",
@@ -5781,7 +5909,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/has-property-descriptors/-/has-property-descriptors-1.0.2.tgz",
       "integrity": "sha512-55JNKuIW+vq4Ke1BjOTjM2YctQIvCT7GFzHwmfZPGo5wnrgkid0YQtnAleFSqumZm4az3n2BS+erby5ipJdgrg==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "es-define-property": "^1.0.0"
@@ -6005,6 +6132,22 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/is-arguments": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/is-arguments/-/is-arguments-1.2.0.tgz",
+      "integrity": "sha512-7bVbi0huj/wrIAOzb8U1aszg9kdi3KN/CyU19CTI7tAoZYEZoL9yCDXpbXN+uPsuWnP02cyug1gleqq+TU+YCA==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "has-tostringtag": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/is-arrayish": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.2.1.tgz",
@@ -6025,6 +6168,18 @@
         "node": ">=8"
       }
     },
+    "node_modules/is-callable": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.2.7.tgz",
+      "integrity": "sha512-1BC0BVFhS/p0qtw6enp8e+8OD0UrK0oFLztSjNzhcKA3WDuJxxAPXzPuPtKkjEY9UUoEWlX/8fgKeu2S8i9JTA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/is-core-module": {
       "version": "2.16.1",
       "resolved": "https://registry.npmjs.org/is-core-module/-/is-core-module-2.16.1.tgz",
@@ -6071,6 +6226,25 @@
         "node": ">=6"
       }
     },
+    "node_modules/is-generator-function": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/is-generator-function/-/is-generator-function-1.1.2.tgz",
+      "integrity": "sha512-upqt1SkGkODW9tsGNG5mtXTXtECizwtS2kA161M+gJPc1xdb/Ax629af6YrTwcOeQHbewrPNlE5Dx7kzvXTizA==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.4",
+        "generator-function": "^2.0.0",
+        "get-proto": "^1.0.1",
+        "has-tostringtag": "^1.0.2",
+        "safe-regex-test": "^1.1.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/is-glob": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.3.tgz",
@@ -6114,6 +6288,24 @@
         "node": ">=8"
       }
     },
+    "node_modules/is-regex": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.2.1.tgz",
+      "integrity": "sha512-MjYsKHO5O7mCsmRGxWcLWheFqN9DJ/2TmngvjKXihe6efViPqc274+Fx/4fYj/r03+ESvBdTXK0V6tA3rgez1g==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "gopd": "^1.2.0",
+        "has-tostringtag": "^1.0.2",
+        "hasown": "^2.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/is-stream": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-2.0.1.tgz",
@@ -6127,6 +6319,21 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/is-typed-array": {
+      "version": "1.1.15",
+      "resolved": "https://registry.npmjs.org/is-typed-array/-/is-typed-array-1.1.15.tgz",
+      "integrity": "sha512-p3EcsicXjit7SaskXHs1hA91QxgTw46Fv6EFKKGS5DRFLD8yKnohjF3hxoju94b/OcMZoQukzpPpBE9uLVKzgQ==",
+      "license": "MIT",
+      "dependencies": {
+        "which-typed-array": "^1.1.16"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/is-unicode-supported": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/is-unicode-supported/-/is-unicode-supported-0.1.0.tgz",
@@ -7501,6 +7708,40 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/minio": {
+      "version": "8.0.6",
+      "resolved": "https://registry.npmjs.org/minio/-/minio-8.0.6.tgz",
+      "integrity": "sha512-sOeh2/b/XprRmEtYsnNRFtOqNRTPDvYtMWh+spWlfsuCV/+IdxNeKVUMKLqI7b5Dr07ZqCPuaRGU/rB9pZYVdQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "async": "^3.2.4",
+        "block-stream2": "^2.1.0",
+        "browser-or-node": "^2.1.1",
+        "buffer-crc32": "^1.0.0",
+        "eventemitter3": "^5.0.1",
+        "fast-xml-parser": "^4.4.1",
+        "ipaddr.js": "^2.0.1",
+        "lodash": "^4.17.21",
+        "mime-types": "^2.1.35",
+        "query-string": "^7.1.3",
+        "stream-json": "^1.8.0",
+        "through2": "^4.0.2",
+        "web-encoding": "^1.1.5",
+        "xml2js": "^0.5.0 || ^0.6.2"
+      },
+      "engines": {
+        "node": "^16 || ^18 || >=20"
+      }
+    },
+    "node_modules/minio/node_modules/ipaddr.js": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-2.3.0.tgz",
+      "integrity": "sha512-Zv/pA+ciVFbCSBBjGfaKUya/CcGmUHzTydLMaTwrUUEM2DIEO3iZvueGxmacvmN50fGpGVKeTXpb2LcYQxeVdg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/minipass": {
       "version": "7.1.2",
       "resolved": "https://registry.npmjs.org/minipass/-/minipass-7.1.2.tgz",
@@ -8104,6 +8345,15 @@
         "node": ">=4"
       }
     },
+    "node_modules/possible-typed-array-names": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/possible-typed-array-names/-/possible-typed-array-names-1.1.0.tgz",
+      "integrity": "sha512-/+5VFTchJDoVj3bhoqi6UeymcD00DAwb1nJwamzPvHEszJ4FpF6SNNbUbOS8yI56qHzdV8eK0qEfOSiodkTdxg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/prelude-ls": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
@@ -8268,6 +8518,24 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/query-string": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/query-string/-/query-string-7.1.3.tgz",
+      "integrity": "sha512-hh2WYhq4fi8+b+/2Kg9CEge4fDPvHS534aOOvOZeQ3+Vf2mCFsaFBYj0i+iXcAq6I9Vzp5fjMFBlONvayDC1qg==",
+      "license": "MIT",
+      "dependencies": {
+        "decode-uri-component": "^0.2.2",
+        "filter-obj": "^1.1.0",
+        "split-on-first": "^1.0.0",
+        "strict-uri-encode": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/queue-microtask": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/queue-microtask/-/queue-microtask-1.2.3.tgz",
@@ -8630,12 +8898,35 @@
       ],
       "license": "MIT"
     },
+    "node_modules/safe-regex-test": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/safe-regex-test/-/safe-regex-test-1.1.0.tgz",
+      "integrity": "sha512-x/+Cz4YrimQxQccJf5mKEbIa1NzeCRNI5Ecl/ekmlYaampdNLPalVyIcCZNNH3MvmqBugV5TMYZXv0ljslUlaw==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "es-errors": "^1.3.0",
+        "is-regex": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
       "license": "MIT"
     },
+    "node_modules/sax": {
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/sax/-/sax-1.4.3.tgz",
+      "integrity": "sha512-yqYn1JhPczigF94DMS+shiDMjDowYO6y9+wB/4WgO0Y19jWYk0lQ4tuG5KI7kj4FTp1wxPj5IFfcrz/s1c3jjQ==",
+      "license": "BlueOak-1.0.0"
+    },
     "node_modules/schema-utils": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-3.3.0.tgz",
@@ -8779,7 +9070,6 @@
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/set-function-length/-/set-function-length-1.2.2.tgz",
       "integrity": "sha512-pgRc4hJ4/sNjWCSS9AmnS40x3bNMDTknHgL5UaMBTMyJnU90EgWh1Rz+MC9eFu4BuN/UwZjKQuY/1v3rM7HMfg==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "define-data-property": "^1.1.4",
@@ -8955,6 +9245,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/split-on-first": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/split-on-first/-/split-on-first-1.1.0.tgz",
+      "integrity": "sha512-43ZssAJaMusuKWL8sKUBQXHWOpq8d6CfN/u1p4gUzfJkM05C8rxTmYrkIPTXapZpORA6LkkzcUulJ8FqA7Uudw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -8994,6 +9293,21 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/stream-chain": {
+      "version": "2.2.5",
+      "resolved": "https://registry.npmjs.org/stream-chain/-/stream-chain-2.2.5.tgz",
+      "integrity": "sha512-1TJmBx6aSWqZ4tx7aTpBDXK0/e2hhcNSTV8+CbFJtDjbb+I1mZ8lHit0Grw9GRT+6JbIrrDd8esncgBi8aBXGA==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/stream-json": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/stream-json/-/stream-json-1.9.1.tgz",
+      "integrity": "sha512-uWkjJ+2Nt/LO9Z/JyKZbMusL8Dkh97uUBTv3AJQ74y07lVahLY4eEFsPsE97pxYBwr8nnjMAIch5eqI0gPShyw==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "stream-chain": "^2.2.5"
+      }
+    },
     "node_modules/streamsearch": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/streamsearch/-/streamsearch-1.1.0.tgz",
@@ -9002,6 +9316,15 @@
         "node": ">=10.0.0"
       }
     },
+    "node_modules/strict-uri-encode": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-2.0.0.tgz",
+      "integrity": "sha512-QwiXZgpRcKkhTj2Scnn++4PKtWsH0kpzZ62L2R6c/LUVYv7hVnZqcg2+sMuT6R7Jusu1vviK/MFsu6kNJfWlEQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/string_decoder": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
@@ -9116,6 +9439,18 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/strnum": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/strnum/-/strnum-1.1.2.tgz",
+      "integrity": "sha512-vrN+B7DBIoTTZjnPNewwhx6cBA/H+IS7rfW68n7XxC1y7uoiGQBxaKzqucGUgavX15dJgiGztLJ8vxuEzwqBdA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/strtok3": {
       "version": "10.3.4",
       "resolved": "https://registry.npmjs.org/strtok3/-/strtok3-10.3.4.tgz",
@@ -9441,6 +9776,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/through2": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-4.0.2.tgz",
+      "integrity": "sha512-iOqSav00cVxEEICeD7TjLB1sueEL+81Wpzp2bY17uZjZN0pWZPuo4suZ/61VujxmqSGFfgOcNuTZ85QJwNZQpw==",
+      "license": "MIT",
+      "dependencies": {
+        "readable-stream": "3"
+      }
+    },
     "node_modules/tmp": {
       "version": "0.0.33",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
@@ -9883,6 +10227,19 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/util": {
+      "version": "0.12.5",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.12.5.tgz",
+      "integrity": "sha512-kZf/K6hEIrWHI6XqOFUiiMa+79wE/D8Q+NCNAWclkyg3b4d2k7s0QGepNjiABc+aR3N1PAyHL7p6UcLY6LmrnA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "is-arguments": "^1.0.4",
+        "is-generator-function": "^1.0.7",
+        "is-typed-array": "^1.1.3",
+        "which-typed-array": "^1.1.2"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -9985,6 +10342,18 @@
         "defaults": "^1.0.3"
       }
     },
+    "node_modules/web-encoding": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/web-encoding/-/web-encoding-1.1.5.tgz",
+      "integrity": "sha512-HYLeVCdJ0+lBYV2FvNZmv3HJ2Nt0QYXqZojk3d9FJOLkwnuhzM9tmamh8d7HPM8QqjKH8DeHkFTx+CFlWpZZDA==",
+      "license": "MIT",
+      "dependencies": {
+        "util": "^0.12.3"
+      },
+      "optionalDependencies": {
+        "@zxing/text-encoding": "0.9.0"
+      }
+    },
     "node_modules/webidl-conversions": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
@@ -10131,6 +10500,27 @@
         "node": ">= 8"
       }
     },
+    "node_modules/which-typed-array": {
+      "version": "1.1.19",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.19.tgz",
+      "integrity": "sha512-rEvr90Bck4WZt9HHFC4DJMsjvu7x+r6bImz0/BrbWb7A2djJ8hnZMrWnHo9F8ssv0OMErasDhftrfROTyqSDrw==",
+      "license": "MIT",
+      "dependencies": {
+        "available-typed-arrays": "^1.0.7",
+        "call-bind": "^1.0.8",
+        "call-bound": "^1.0.4",
+        "for-each": "^0.3.5",
+        "get-proto": "^1.0.1",
+        "gopd": "^1.2.0",
+        "has-tostringtag": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
@@ -10210,6 +10600,28 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/xml2js": {
+      "version": "0.6.2",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.6.2.tgz",
+      "integrity": "sha512-T4rieHaC1EXcES0Kxxj4JWgaUQHDk+qwHcYOCFHfiwKz7tOVPLq7Hjq9dM1WCMhylqMEfP7hMcOIChvotiZegA==",
+      "license": "MIT",
+      "dependencies": {
+        "sax": ">=0.6.0",
+        "xmlbuilder": "~11.0.0"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/xmlbuilder": {
+      "version": "11.0.1",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-11.0.1.tgz",
+      "integrity": "sha512-fDlsI/kFEx7gLvbecc0/ohLG50fugQp8ryHzMTuW9vSa1GJ0XYWKnhsUx7oie3G98+r56aTQIUB4kht42R3JvA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=4.0"
+      }
+    },
     "node_modules/xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
diff --git a/backend/services/planting-service/package.json b/backend/services/planting-service/package.json
index e3bf7eac..f213b5cc 100644
--- a/backend/services/planting-service/package.json
+++ b/backend/services/planting-service/package.json
@@ -40,6 +40,7 @@
     "class-validator": "^0.14.0",
     "jsonwebtoken": "^9.0.0",
     "kafkajs": "^2.2.4",
+    "minio": "^8.0.6",
     "passport": "^0.7.0",
     "passport-jwt": "^4.0.1",
     "pdf-lib": "^1.17.1",
@@ -54,6 +55,7 @@
     "@types/express": "^4.17.17",
     "@types/jest": "^29.5.2",
     "@types/jsonwebtoken": "^9.0.0",
+    "@types/minio": "^7.1.0",
     "@types/node": "^20.3.1",
     "@types/passport-jwt": "^4.0.0",
     "@types/supertest": "^2.0.12",
diff --git a/backend/services/planting-service/prisma/migrations/20241225000000_add_signed_pdf_url/migration.sql b/backend/services/planting-service/prisma/migrations/20241225000000_add_signed_pdf_url/migration.sql
new file mode 100644
index 00000000..22959481
--- /dev/null
+++ b/backend/services/planting-service/prisma/migrations/20241225000000_add_signed_pdf_url/migration.sql
@@ -0,0 +1,2 @@
+-- AlterTable: Add signed_pdf_url column to contract_signing_tasks
+ALTER TABLE "contract_signing_tasks" ADD COLUMN "signed_pdf_url" VARCHAR(500);
diff --git a/backend/services/planting-service/prisma/schema.prisma b/backend/services/planting-service/prisma/schema.prisma
index 6add0adf..fc34c0ec 100644
--- a/backend/services/planting-service/prisma/schema.prisma
+++ b/backend/services/planting-service/prisma/schema.prisma
@@ -353,6 +353,7 @@ model ContractSigningTask {
   // 签名数据
   signatureCloudUrl String? @map("signature_cloud_url") @db.VarChar(500)
   signatureHash     String? @map("signature_hash") @db.VarChar(64) // SHA256
+  signedPdfUrl      String? @map("signed_pdf_url") @db.VarChar(500) // 已签署合同PDF的云存储URL
 
   // 法律合规证据链
   signingIpAddress   String? @map("signing_ip_address") @db.VarChar(50)
diff --git a/backend/services/planting-service/src/api/controllers/contract-signing.controller.ts b/backend/services/planting-service/src/api/controllers/contract-signing.controller.ts
index fe560f0a..dd17f0ee 100644
--- a/backend/services/planting-service/src/api/controllers/contract-signing.controller.ts
+++ b/backend/services/planting-service/src/api/controllers/contract-signing.controller.ts
@@ -17,6 +17,8 @@ import { Response } from 'express';
 import { JwtAuthGuard } from '../guards/jwt-auth.guard';
 import { ContractSigningService } from '../../application/services/contract-signing.service';
 import { PdfGeneratorService } from '../../infrastructure/pdf/pdf-generator.service';
+import { MinioStorageService } from '../../infrastructure/storage/minio-storage.service';
+import * as crypto from 'crypto';
 
 /**
  * 签署合同请求DTO
@@ -77,6 +79,7 @@ export class ContractSigningController {
   constructor(
     private readonly contractSigningService: ContractSigningService,
     private readonly pdfGeneratorService: PdfGeneratorService,
+    private readonly minioStorageService: MinioStorageService,
   ) {}
 
   /**
@@ -197,13 +200,63 @@ export class ContractSigningController {
     const userAgent = req.headers['user-agent'] || 'unknown';
 
     try {
-      // TODO: 上传签名图片到云存储，获取URL
-      // 目前暂时使用base64数据作为URL占位
-      const signatureCloudUrl = `data:image/png;base64,${dto.signatureBase64.slice(0, 100)}...`;
+      // 1. 获取任务详情
+      const task = await this.contractSigningService.getTask(orderNo, userId);
+      if (!task) {
+        throw new Error('签署任务不存在');
+      }
 
+      // 2. 解码签名图片
+      const signatureBuffer = Buffer.from(dto.signatureBase64, 'base64');
+      this.logger.log(`Signature size: ${signatureBuffer.length} bytes for order ${orderNo}`);
+
+      // 3. 计算签名哈希（如果前端没有提供）
+      const signatureHash = dto.signatureHash || crypto.createHash('sha256').update(signatureBuffer).digest('hex');
+
+      // 4. 上传签名图片到 MinIO
+      let signatureCloudUrl: string;
+      try {
+        signatureCloudUrl = await this.minioStorageService.uploadSignature(orderNo, signatureBuffer);
+        this.logger.log(`Signature uploaded to: ${signatureCloudUrl}`);
+      } catch (uploadError) {
+        this.logger.warn(`Failed to upload signature, using placeholder: ${uploadError.message}`);
+        // 如果上传失败，使用占位 URL（允许服务继续工作）
+        signatureCloudUrl = `data:image/png;base64,${dto.signatureBase64.slice(0, 100)}...`;
+      }
+
+      // 5. 生成带签名的 PDF
+      const signingDate = new Date().toISOString().split('T')[0];
+      let pdfBuffer = await this.pdfGeneratorService.generateContractPdf({
+        orderNo: task.orderNo,
+        userRealName: task.userRealName || '未认证',
+        userIdCard: task.userIdCardNumber || '',
+        userPhone: task.userPhoneNumber || '',
+        treeCount: task.treeCount,
+        signingDate,
+      });
+
+      // 6. 嵌入签名到 PDF
+      pdfBuffer = await this.pdfGeneratorService.embedSignature(pdfBuffer, {
+        signatureImagePng: signatureBuffer,
+      });
+      this.logger.log(`Signed PDF generated: ${pdfBuffer.length} bytes`);
+
+      // 7. 上传签署后的 PDF 到 MinIO
+      let signedPdfUrl: string;
+      try {
+        signedPdfUrl = await this.minioStorageService.uploadSignedPdf(orderNo, pdfBuffer);
+        this.logger.log(`Signed PDF uploaded to: ${signedPdfUrl}`);
+      } catch (uploadError) {
+        this.logger.warn(`Failed to upload signed PDF: ${uploadError.message}`);
+        // 如果上传失败，使用空 URL（数据库允许 null）
+        signedPdfUrl = '';
+      }
+
+      // 8. 完成签署
       await this.contractSigningService.signContract(orderNo, userId, {
         signatureCloudUrl,
-        signatureHash: dto.signatureHash,
+        signatureHash,
+        signedPdfUrl,
         ipAddress,
         deviceInfo: dto.deviceInfo,
         userAgent,
@@ -238,12 +291,61 @@ export class ContractSigningController {
     const userAgent = req.headers['user-agent'] || 'unknown';
 
     try {
-      // TODO: 上传签名图片到云存储，获取URL
-      const signatureCloudUrl = `data:image/png;base64,${dto.signatureBase64.slice(0, 100)}...`;
+      // 1. 获取任务详情
+      const task = await this.contractSigningService.getTask(orderNo, userId);
+      if (!task) {
+        throw new Error('签署任务不存在');
+      }
 
+      // 2. 解码签名图片
+      const signatureBuffer = Buffer.from(dto.signatureBase64, 'base64');
+      this.logger.log(`Signature size: ${signatureBuffer.length} bytes for late-sign order ${orderNo}`);
+
+      // 3. 计算签名哈希（如果前端没有提供）
+      const signatureHash = dto.signatureHash || crypto.createHash('sha256').update(signatureBuffer).digest('hex');
+
+      // 4. 上传签名图片到 MinIO
+      let signatureCloudUrl: string;
+      try {
+        signatureCloudUrl = await this.minioStorageService.uploadSignature(orderNo, signatureBuffer);
+        this.logger.log(`Signature uploaded to: ${signatureCloudUrl}`);
+      } catch (uploadError) {
+        this.logger.warn(`Failed to upload signature, using placeholder: ${uploadError.message}`);
+        signatureCloudUrl = `data:image/png;base64,${dto.signatureBase64.slice(0, 100)}...`;
+      }
+
+      // 5. 生成带签名的 PDF
+      const signingDate = new Date().toISOString().split('T')[0];
+      let pdfBuffer = await this.pdfGeneratorService.generateContractPdf({
+        orderNo: task.orderNo,
+        userRealName: task.userRealName || '未认证',
+        userIdCard: task.userIdCardNumber || '',
+        userPhone: task.userPhoneNumber || '',
+        treeCount: task.treeCount,
+        signingDate,
+      });
+
+      // 6. 嵌入签名到 PDF
+      pdfBuffer = await this.pdfGeneratorService.embedSignature(pdfBuffer, {
+        signatureImagePng: signatureBuffer,
+      });
+      this.logger.log(`Signed PDF generated: ${pdfBuffer.length} bytes`);
+
+      // 7. 上传签署后的 PDF 到 MinIO
+      let signedPdfUrl: string;
+      try {
+        signedPdfUrl = await this.minioStorageService.uploadSignedPdf(orderNo, pdfBuffer);
+        this.logger.log(`Signed PDF uploaded to: ${signedPdfUrl}`);
+      } catch (uploadError) {
+        this.logger.warn(`Failed to upload signed PDF: ${uploadError.message}`);
+        signedPdfUrl = '';
+      }
+
+      // 8. 完成补签
       await this.contractSigningService.lateSignContract(orderNo, userId, {
         signatureCloudUrl,
-        signatureHash: dto.signatureHash,
+        signatureHash,
+        signedPdfUrl,
         ipAddress,
         deviceInfo: dto.deviceInfo,
         userAgent,
diff --git a/backend/services/planting-service/src/domain/aggregates/contract-signing-task.aggregate.ts b/backend/services/planting-service/src/domain/aggregates/contract-signing-task.aggregate.ts
index a1d213cc..1aa336d7 100644
--- a/backend/services/planting-service/src/domain/aggregates/contract-signing-task.aggregate.ts
+++ b/backend/services/planting-service/src/domain/aggregates/contract-signing-task.aggregate.ts
@@ -53,6 +53,7 @@ export interface CreateContractSigningTaskParams {
 export interface SignContractParams {
   signatureCloudUrl: string;
   signatureHash: string;
+  signedPdfUrl: string;
   ipAddress: string;
   deviceInfo: DeviceInfo;
   userAgent: string;
@@ -83,6 +84,7 @@ export class ContractSigningTask {
   private _signedAt?: Date;
   private _signatureCloudUrl?: string;
   private _signatureHash?: string;
+  private _signedPdfUrl?: string;
   private _signingIpAddress?: string;
   private _signingDeviceInfo?: DeviceInfo;
   private _signingUserAgent?: string;
@@ -152,6 +154,7 @@ export class ContractSigningTask {
     signedAt?: Date;
     signatureCloudUrl?: string;
     signatureHash?: string;
+    signedPdfUrl?: string;
     signingIpAddress?: string;
     signingDeviceInfo?: DeviceInfo;
     signingUserAgent?: string;
@@ -184,6 +187,7 @@ export class ContractSigningTask {
     task._signedAt = data.signedAt;
     task._signatureCloudUrl = data.signatureCloudUrl;
     task._signatureHash = data.signatureHash;
+    task._signedPdfUrl = data.signedPdfUrl;
     task._signingIpAddress = data.signingIpAddress;
     task._signingDeviceInfo = data.signingDeviceInfo;
     task._signingUserAgent = data.signingUserAgent;
@@ -290,6 +294,10 @@ export class ContractSigningTask {
     return this._signatureHash;
   }
 
+  get signedPdfUrl(): string | undefined {
+    return this._signedPdfUrl;
+  }
+
   get signingIpAddress(): string | undefined {
     return this._signingIpAddress;
   }
@@ -391,6 +399,7 @@ export class ContractSigningTask {
     this._signedAt = new Date();
     this._signatureCloudUrl = params.signatureCloudUrl;
     this._signatureHash = params.signatureHash;
+    this._signedPdfUrl = params.signedPdfUrl;
     this._signingIpAddress = params.ipAddress;
     this._signingDeviceInfo = params.deviceInfo;
     this._signingUserAgent = params.userAgent;
@@ -428,6 +437,7 @@ export class ContractSigningTask {
     this._signedAt = new Date();
     this._signatureCloudUrl = params.signatureCloudUrl;
     this._signatureHash = params.signatureHash;
+    this._signedPdfUrl = params.signedPdfUrl;
     this._signingIpAddress = params.ipAddress;
     this._signingDeviceInfo = params.deviceInfo;
     this._signingUserAgent = params.userAgent;
diff --git a/backend/services/planting-service/src/infrastructure/infrastructure.module.ts b/backend/services/planting-service/src/infrastructure/infrastructure.module.ts
index 653b5cf4..959a0d9e 100644
--- a/backend/services/planting-service/src/infrastructure/infrastructure.module.ts
+++ b/backend/services/planting-service/src/infrastructure/infrastructure.module.ts
@@ -16,6 +16,7 @@ import { OutboxPublisherService } from './kafka/outbox-publisher.service';
 import { EventAckController } from './kafka/event-ack.controller';
 import { ContractSigningEventConsumer } from './kafka/contract-signing-event.consumer';
 import { PdfGeneratorService } from './pdf/pdf-generator.service';
+import { MinioStorageService } from './storage/minio-storage.service';
 import { PLANTING_ORDER_REPOSITORY } from '../domain/repositories/planting-order.repository.interface';
 import { PLANTING_POSITION_REPOSITORY } from '../domain/repositories/planting-position.repository.interface';
 import { POOL_INJECTION_BATCH_REPOSITORY } from '../domain/repositories/pool-injection-batch.repository.interface';
@@ -66,6 +67,7 @@ import { ContractSigningService } from '../application/services/contract-signing
     PaymentCompensationService,
     ContractSigningService,
     PdfGeneratorService,
+    MinioStorageService,
     WalletServiceClient,
     ReferralServiceClient,
   ],
@@ -83,6 +85,7 @@ import { ContractSigningService } from '../application/services/contract-signing
     PaymentCompensationService,
     ContractSigningService,
     PdfGeneratorService,
+    MinioStorageService,
     WalletServiceClient,
     ReferralServiceClient,
   ],
diff --git a/backend/services/planting-service/src/infrastructure/persistence/repositories/contract-signing-task.repository.impl.ts b/backend/services/planting-service/src/infrastructure/persistence/repositories/contract-signing-task.repository.impl.ts
index e44c7c37..84f59741 100644
--- a/backend/services/planting-service/src/infrastructure/persistence/repositories/contract-signing-task.repository.impl.ts
+++ b/backend/services/planting-service/src/infrastructure/persistence/repositories/contract-signing-task.repository.impl.ts
@@ -28,6 +28,7 @@ export class ContractSigningTaskRepositoryImpl implements IContractSigningTaskRe
           signedAt: task.signedAt,
           signatureCloudUrl: task.signatureCloudUrl,
           signatureHash: task.signatureHash,
+          signedPdfUrl: task.signedPdfUrl,
           signingIpAddress: task.signingIpAddress,
           signingDeviceInfo: deviceInfoJson,
           signingUserAgent: task.signingUserAgent,
@@ -193,6 +194,7 @@ export class ContractSigningTaskRepositoryImpl implements IContractSigningTaskRe
     signedAt: Date | null;
     signatureCloudUrl: string | null;
     signatureHash: string | null;
+    signedPdfUrl: string | null;
     signingIpAddress: string | null;
     signingDeviceInfo: string | null;
     signingUserAgent: string | null;
@@ -234,6 +236,7 @@ export class ContractSigningTaskRepositoryImpl implements IContractSigningTaskRe
       signedAt: data.signedAt ?? undefined,
       signatureCloudUrl: data.signatureCloudUrl ?? undefined,
       signatureHash: data.signatureHash ?? undefined,
+      signedPdfUrl: data.signedPdfUrl ?? undefined,
       signingIpAddress: data.signingIpAddress ?? undefined,
       signingDeviceInfo: deviceInfo,
       signingUserAgent: data.signingUserAgent ?? undefined,
diff --git a/backend/services/planting-service/src/infrastructure/storage/minio-storage.service.ts b/backend/services/planting-service/src/infrastructure/storage/minio-storage.service.ts
new file mode 100644
index 00000000..15288db7
--- /dev/null
+++ b/backend/services/planting-service/src/infrastructure/storage/minio-storage.service.ts
@@ -0,0 +1,157 @@
+import { Injectable, Logger, OnModuleInit } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import * as Minio from 'minio';
+import * as crypto from 'crypto';
+
+/**
+ * MinIO 存储服务
+ *
+ * 负责上传合同签名图片和已签署的 PDF 文件到 MinIO 对象存储
+ */
+@Injectable()
+export class MinioStorageService implements OnModuleInit {
+  private readonly logger = new Logger(MinioStorageService.name);
+  private minioClient: Minio.Client;
+  private readonly bucketName: string;
+  private readonly publicUrl: string;
+
+  constructor(private readonly configService: ConfigService) {
+    const endpoint = this.configService.get<string>('MINIO_ENDPOINT', 'localhost');
+    const port = parseInt(this.configService.get<string>('MINIO_PORT', '9000'), 10);
+    const useSSL = this.configService.get<string>('MINIO_USE_SSL', 'false') === 'true';
+    const accessKey = this.configService.get<string>('MINIO_ACCESS_KEY', 'admin');
+    const secretKey = this.configService.get<string>('MINIO_SECRET_KEY', 'minio_secret_password');
+
+    this.bucketName = this.configService.get<string>('MINIO_BUCKET_CONTRACTS', 'contracts');
+    this.publicUrl = this.configService.get<string>('MINIO_PUBLIC_URL', `http://${endpoint}:${port}`);
+
+    this.minioClient = new Minio.Client({
+      endPoint: endpoint,
+      port: port,
+      useSSL: useSSL,
+      accessKey: accessKey,
+      secretKey: secretKey,
+    });
+
+    this.logger.log(`MinIO client configured: ${endpoint}:${port}, bucket: ${this.bucketName}`);
+  }
+
+  async onModuleInit() {
+    await this.ensureBucketExists();
+  }
+
+  /**
+   * 确保存储桶存在
+   */
+  private async ensureBucketExists(): Promise<void> {
+    try {
+      const exists = await this.minioClient.bucketExists(this.bucketName);
+      if (!exists) {
+        await this.minioClient.makeBucket(this.bucketName, 'cn-east-1');
+        this.logger.log(`Created bucket: ${this.bucketName}`);
+
+        // 设置桶策略为公开读取
+        const policy = {
+          Version: '2012-10-17',
+          Statement: [
+            {
+              Effect: 'Allow',
+              Principal: { AWS: ['*'] },
+              Action: ['s3:GetObject'],
+              Resource: [`arn:aws:s3:::${this.bucketName}/*`],
+            },
+          ],
+        };
+        await this.minioClient.setBucketPolicy(this.bucketName, JSON.stringify(policy));
+        this.logger.log(`Set public read policy for bucket: ${this.bucketName}`);
+      } else {
+        this.logger.log(`Bucket exists: ${this.bucketName}`);
+      }
+    } catch (error) {
+      this.logger.error(`Failed to ensure bucket exists: ${error.message}`);
+      // 不抛出错误，允许服务继续启动（可能 MinIO 暂时不可用）
+    }
+  }
+
+  /**
+   * 上传签名图片
+   * @param orderNo 订单号
+   * @param signatureBuffer 签名图片 Buffer (PNG)
+   * @returns 签名图片的公开 URL
+   */
+  async uploadSignature(orderNo: string, signatureBuffer: Buffer): Promise<string> {
+    const timestamp = Date.now();
+    const hash = crypto.createHash('md5').update(signatureBuffer).digest('hex').slice(0, 8);
+    const objectName = `signatures/${orderNo}/${timestamp}-${hash}.png`;
+
+    try {
+      await this.minioClient.putObject(
+        this.bucketName,
+        objectName,
+        signatureBuffer,
+        signatureBuffer.length,
+        {
+          'Content-Type': 'image/png',
+          'x-amz-acl': 'public-read',
+        },
+      );
+
+      const url = `${this.publicUrl}/${this.bucketName}/${objectName}`;
+      this.logger.log(`Uploaded signature for order ${orderNo}: ${url}`);
+      return url;
+    } catch (error) {
+      this.logger.error(`Failed to upload signature for order ${orderNo}: ${error.message}`);
+      throw new Error(`签名图片上传失败: ${error.message}`);
+    }
+  }
+
+  /**
+   * 上传已签署的合同 PDF
+   * @param orderNo 订单号
+   * @param pdfBuffer PDF 文件 Buffer
+   * @returns PDF 文件的公开 URL
+   */
+  async uploadSignedPdf(orderNo: string, pdfBuffer: Buffer): Promise<string> {
+    const timestamp = Date.now();
+    const objectName = `contracts/${orderNo}/signed-contract-${timestamp}.pdf`;
+
+    try {
+      await this.minioClient.putObject(
+        this.bucketName,
+        objectName,
+        pdfBuffer,
+        pdfBuffer.length,
+        {
+          'Content-Type': 'application/pdf',
+          'x-amz-acl': 'public-read',
+          'Content-Disposition': `inline; filename="contract-${orderNo}.pdf"`,
+        },
+      );
+
+      const url = `${this.publicUrl}/${this.bucketName}/${objectName}`;
+      this.logger.log(`Uploaded signed PDF for order ${orderNo}: ${url}`);
+      return url;
+    } catch (error) {
+      this.logger.error(`Failed to upload signed PDF for order ${orderNo}: ${error.message}`);
+      throw new Error(`已签署合同上传失败: ${error.message}`);
+    }
+  }
+
+  /**
+   * 删除文件
+   * @param objectUrl 文件的公开 URL
+   */
+  async deleteObject(objectUrl: string): Promise<void> {
+    try {
+      // 从 URL 中提取对象名称
+      const urlParts = objectUrl.replace(this.publicUrl, '').split('/');
+      const objectName = urlParts.slice(2).join('/'); // 去掉空字符串和桶名
+
+      await this.minioClient.removeObject(this.bucketName, objectName);
+      this.logger.log(`Deleted object: ${objectName}`);
+    } catch (error) {
+      this.logger.error(`Failed to delete object: ${error.message}`);
+      // 删除失败不抛出错误
+    }
+  }
+}
diff --git a/frontend/mobile-app/lib/core/services/contract_signing_service.dart b/frontend/mobile-app/lib/core/services/contract_signing_service.dart
index 183b16d1..10d5ef71 100644
--- a/frontend/mobile-app/lib/core/services/contract_signing_service.dart
+++ b/frontend/mobile-app/lib/core/services/contract_signing_service.dart
@@ -368,15 +368,17 @@ class ContractSigningService {
 
       if (response.statusCode == 200) {
         final responseData = response.data as Map<String, dynamic>;
-        if (responseData['success'] == true && responseData['data'] != null) {
-          final data = responseData['data'] as Map<String, dynamic>;
-          debugPrint('[ContractSigningService] 签署成功，任务状态: ${data['status']}');
-          return ContractSigningTask.fromJson(data);
-        }
-        // 兼容直接返回任务数据的情况
-        if (responseData['orderNo'] != null) {
-          debugPrint('[ContractSigningService] 签署成功（直接返回数据）');
-          return ContractSigningTask.fromJson(responseData);
+        if (responseData['success'] == true) {
+          debugPrint('[ContractSigningService] 签署成功');
+          // 后端可能返回 data，也可能只返回 success + message
+          if (responseData['data'] != null) {
+            final data = responseData['data'] as Map<String, dynamic>;
+            debugPrint('[ContractSigningService] 返回任务数据，状态: ${data['status']}');
+            return ContractSigningTask.fromJson(data);
+          }
+          // 如果没有返回 data，重新获取任务详情
+          debugPrint('[ContractSigningService] 重新获取任务详情');
+          return await getTask(orderNo);
         }
         throw Exception('签署合同失败: ${responseData['message'] ?? '响应格式错误'}');
       }
@@ -431,15 +433,17 @@ class ContractSigningService {
 
       if (response.statusCode == 200) {
         final responseData = response.data as Map<String, dynamic>;
-        if (responseData['success'] == true && responseData['data'] != null) {
-          final data = responseData['data'] as Map<String, dynamic>;
-          debugPrint('[ContractSigningService] 补签成功，任务状态: ${data['status']}');
-          return ContractSigningTask.fromJson(data);
-        }
-        // 兼容直接返回任务数据的情况
-        if (responseData['orderNo'] != null) {
-          debugPrint('[ContractSigningService] 补签成功（直接返回数据）');
-          return ContractSigningTask.fromJson(responseData);
+        if (responseData['success'] == true) {
+          debugPrint('[ContractSigningService] 补签成功');
+          // 后端可能返回 data，也可能只返回 success + message
+          if (responseData['data'] != null) {
+            final data = responseData['data'] as Map<String, dynamic>;
+            debugPrint('[ContractSigningService] 返回任务数据，状态: ${data['status']}');
+            return ContractSigningTask.fromJson(data);
+          }
+          // 如果没有返回 data，重新获取任务详情
+          debugPrint('[ContractSigningService] 重新获取任务详情');
+          return await getTask(orderNo);
         }
         throw Exception('补签合同失败: ${responseData['message'] ?? '响应格式错误'}');
       }