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 1945ecc1..c7e2377c 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
@@ -109,6 +109,30 @@ export class ContractSigningController {
     };
   }
 
+  /**
+   * 检查用户是否需要先完成 KYC
+   *
+   * 如果用户有已付款的认种订单但未完成 KYC，返回需要强制完成 KYC 的信息
+   */
+  @Get('kyc-requirement')
+  async checkKycRequirement(
+    @Request() req: { user: { id: string; accountSequence?: string } },
+  ) {
+    const userId = BigInt(req.user.id);
+    // accountSequence 可能在 token 中，也可能需要从 userId 派生
+    const accountSequence = req.user.accountSequence || req.user.id;
+
+    const result = await this.contractSigningService.checkKycRequirement(
+      userId,
+      accountSequence,
+    );
+
+    return {
+      success: true,
+      data: result,
+    };
+  }
+
   /**
    * 获取签署任务详情
    */
diff --git a/backend/services/planting-service/src/application/services/contract-signing.service.ts b/backend/services/planting-service/src/application/services/contract-signing.service.ts
index 52fa660d..f2d3a9e1 100644
--- a/backend/services/planting-service/src/application/services/contract-signing.service.ts
+++ b/backend/services/planting-service/src/application/services/contract-signing.service.ts
@@ -15,6 +15,7 @@ import {
 import { ContractSigningStatus } from '../../domain/value-objects';
 import { EventPublisherService } from '../../infrastructure/kafka/event-publisher.service';
 import { UnitOfWork, UNIT_OF_WORK } from '../../infrastructure/persistence/unit-of-work';
+import { IdentityServiceClient } from '../../infrastructure/external/identity-service.client';
 
 /**
  * 创建签署任务的参数
@@ -79,6 +80,7 @@ export class ContractSigningService {
     @Inject(UNIT_OF_WORK)
     private readonly unitOfWork: UnitOfWork,
     private readonly eventPublisher: EventPublisherService,
+    private readonly identityClient: IdentityServiceClient,
   ) {}
 
   /**
@@ -160,6 +162,57 @@ export class ContractSigningService {
     return tasks.map((t) => this.toDto(t));
   }
 
+  /**
+   * 检查用户是否需要先完成 KYC
+   *
+   * 条件：用户有已付款的认种订单，但没有对应的合同签署任务（因为未完成KYC）
+   *
+   * @returns 如果需要KYC返回相关信息，否则返回null
+   */
+  async checkKycRequirement(
+    userId: bigint,
+    accountSequence: string,
+  ): Promise<{ requiresKyc: boolean; paidOrderCount: number; message?: string } | null> {
+    try {
+      // 1. 查找已付款但没有合同的订单
+      const ordersWithoutContract = await this.orderRepo.findPaidOrdersWithoutContract(userId);
+
+      if (ordersWithoutContract.length === 0) {
+        return { requiresKyc: false, paidOrderCount: 0 };
+      }
+
+      // 2. 检查用户 KYC 状态
+      const kycInfo = await this.identityClient.getUserKycInfo(accountSequence);
+
+      if (kycInfo) {
+        // 用户已完成 KYC，但合同还没创建（可能是系统延迟）
+        // 这种情况不需要强制 KYC，合同会通过 KYC 完成事件自动创建
+        this.logger.log(
+          `User ${accountSequence} has ${ordersWithoutContract.length} orders without contract, ` +
+            `but KYC is complete. Contracts will be created automatically.`,
+        );
+        return { requiresKyc: false, paidOrderCount: ordersWithoutContract.length };
+      }
+
+      // 3. 用户未完成 KYC，需要强制完成
+      this.logger.log(
+        `User ${accountSequence} has ${ordersWithoutContract.length} paid orders but no KYC. ` +
+          `Requiring KYC verification.`,
+      );
+
+      return {
+        requiresKyc: true,
+        paidOrderCount: ordersWithoutContract.length,
+        message:
+          '系统检测到您已认种了榴莲树，但尚未按国家法规完成实名认证，无法签署合同。请先完成实名认证后才能继续使用APP。',
+      };
+    } catch (error) {
+      this.logger.error(`Failed to check KYC requirement for user ${accountSequence}:`, error);
+      // 出错时不阻止用户，返回不需要 KYC
+      return { requiresKyc: false, paidOrderCount: 0 };
+    }
+  }
+
   /**
    * 获取签署任务详情
    */
diff --git a/frontend/mobile-app/lib/core/services/contract_check_service.dart b/frontend/mobile-app/lib/core/services/contract_check_service.dart
index 74ad8fed..9d393137 100644
--- a/frontend/mobile-app/lib/core/services/contract_check_service.dart
+++ b/frontend/mobile-app/lib/core/services/contract_check_service.dart
@@ -1,8 +1,33 @@
 import 'package:flutter/foundation.dart';
 import 'contract_signing_service.dart';
 
+/// 合同检查结果
+class ContractCheckResult {
+  /// 是否有待签署的合同
+  final bool hasPendingContracts;
+
+  /// 是否需要先完成 KYC
+  final bool requiresKyc;
+
+  /// 需要 KYC 时的提示消息
+  final String? kycMessage;
+
+  /// 已付款但未完成 KYC 的订单数量
+  final int paidOrderCount;
+
+  ContractCheckResult({
+    required this.hasPendingContracts,
+    required this.requiresKyc,
+    this.kycMessage,
+    this.paidOrderCount = 0,
+  });
+
+  /// 是否需要强制操作（有待签署合同或需要 KYC）
+  bool get requiresAction => hasPendingContracts || requiresKyc;
+}
+
 /// 合同检查服务
-/// 用于在 App 启动时检查用户是否有未签署的合同
+/// 用于在 App 启动时检查用户是否有未签署的合同或需要完成 KYC
 class ContractCheckService {
   final ContractSigningService _contractSigningService;
 
@@ -30,6 +55,48 @@ class ContractCheckService {
     }
   }
 
+  /// 综合检查：待签署合同和 KYC 需求
+  ///
+  /// 返回检查结果，包含：
+  /// - 是否有待签署的合同
+  /// - 是否需要先完成 KYC（有已付款订单但未完成 KYC）
+  Future<ContractCheckResult> checkAll() async {
+    try {
+      debugPrint('[ContractCheckService] 开始综合检查...');
+
+      // 1. 检查未签署的合同
+      final unsignedTasks = await _contractSigningService.getUnsignedTasks();
+      final hasPending = unsignedTasks.isNotEmpty;
+      debugPrint('[ContractCheckService] 未签署合同数量: ${unsignedTasks.length}');
+
+      // 2. 如果有待签署的合同，直接返回（不需要再检查 KYC）
+      if (hasPending) {
+        return ContractCheckResult(
+          hasPendingContracts: true,
+          requiresKyc: false,
+        );
+      }
+
+      // 3. 没有待签署合同，检查是否有需要 KYC 的情况
+      final kycResult = await _contractSigningService.checkKycRequirement();
+      debugPrint('[ContractCheckService] KYC 检查结果: requiresKyc=${kycResult.requiresKyc}, paidOrderCount=${kycResult.paidOrderCount}');
+
+      return ContractCheckResult(
+        hasPendingContracts: false,
+        requiresKyc: kycResult.requiresKyc,
+        kycMessage: kycResult.message,
+        paidOrderCount: kycResult.paidOrderCount,
+      );
+    } catch (e) {
+      debugPrint('[ContractCheckService] 综合检查失败: $e');
+      // 检查失败时不阻止用户使用 App
+      return ContractCheckResult(
+        hasPendingContracts: false,
+        requiresKyc: false,
+      );
+    }
+  }
+
   /// 获取待签署合同数量
   Future<int> getPendingContractCount() async {
     try {
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 14ba980a..d3bfaad5 100644
--- a/frontend/mobile-app/lib/core/services/contract_signing_service.dart
+++ b/frontend/mobile-app/lib/core/services/contract_signing_service.dart
@@ -150,6 +150,32 @@ class ContractSigningConfig {
   }
 }
 
+/// KYC 需求检查结果
+class KycRequirementResult {
+  /// 是否需要完成 KYC
+  final bool requiresKyc;
+
+  /// 已付款但未完成 KYC 的订单数量
+  final int paidOrderCount;
+
+  /// 提示消息
+  final String? message;
+
+  KycRequirementResult({
+    required this.requiresKyc,
+    required this.paidOrderCount,
+    this.message,
+  });
+
+  factory KycRequirementResult.fromJson(Map<String, dynamic> json) {
+    return KycRequirementResult(
+      requiresKyc: json['requiresKyc'] ?? false,
+      paidOrderCount: json['paidOrderCount'] ?? 0,
+      message: json['message'],
+    );
+  }
+}
+
 /// 合同签署服务
 class ContractSigningService {
   final ApiClient _apiClient;
@@ -180,6 +206,33 @@ class ContractSigningService {
     }
   }
 
+  /// 检查用户是否需要先完成 KYC
+  ///
+  /// 如果用户有已付款的认种订单但未完成 KYC，返回需要强制完成 KYC 的信息
+  Future<KycRequirementResult> checkKycRequirement() async {
+    try {
+      debugPrint('[ContractSigningService] 检查 KYC 需求');
+
+      final response = await _apiClient.get('/planting/contract-signing/kyc-requirement');
+
+      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] KYC 检查结果: requiresKyc=${data['requiresKyc']}, paidOrderCount=${data['paidOrderCount']}');
+          return KycRequirementResult.fromJson(data);
+        }
+      }
+
+      // 默认不需要 KYC
+      return KycRequirementResult(requiresKyc: false, paidOrderCount: 0);
+    } catch (e) {
+      debugPrint('[ContractSigningService] 检查 KYC 需求失败: $e');
+      // 检查失败时不阻止用户
+      return KycRequirementResult(requiresKyc: false, paidOrderCount: 0);
+    }
+  }
+
   /// 获取待签署任务列表
   Future<List<ContractSigningTask>> getPendingTasks() async {
     try {
diff --git a/frontend/mobile-app/lib/features/home/presentation/pages/home_shell_page.dart b/frontend/mobile-app/lib/features/home/presentation/pages/home_shell_page.dart
index f513bdd1..448dbc96 100644
--- a/frontend/mobile-app/lib/features/home/presentation/pages/home_shell_page.dart
+++ b/frontend/mobile-app/lib/features/home/presentation/pages/home_shell_page.dart
@@ -5,6 +5,7 @@ import 'package:go_router/go_router.dart';
 import '../../../../core/theme/app_colors.dart';
 import '../../../../core/theme/app_dimensions.dart';
 import '../../../../core/di/injection_container.dart';
+import '../../../../core/services/contract_check_service.dart';
 import '../../../../routes/route_paths.dart';
 import '../../../../bootstrap.dart';
 import '../widgets/bottom_nav_bar.dart';
@@ -33,7 +34,7 @@ class _HomeShellPageState extends ConsumerState<HomeShellPage>
     // 首次进入时检查更新和未签署合同
     WidgetsBinding.instance.addPostFrameCallback((_) {
       _checkForUpdateIfNeeded();
-      _checkPendingContracts();
+      _checkContractsAndKyc();
     });
   }
 
@@ -63,27 +64,109 @@ class _HomeShellPageState extends ConsumerState<HomeShellPage>
     }
   }
 
-  /// 检查待签署合同
-  Future<void> _checkPendingContracts() async {
+  /// 综合检查：待签署合同和 KYC 需求
+  Future<void> _checkContractsAndKyc() async {
     // 每次会话只检查一次
     if (_hasCheckedContracts) return;
     _hasCheckedContracts = true;
 
     try {
       final contractCheckService = ref.read(contractCheckServiceProvider);
-      final hasPending = await contractCheckService.hasPendingContracts();
+      final result = await contractCheckService.checkAll();
 
-      if (hasPending && mounted) {
+      if (!mounted) return;
+
+      // 1. 优先处理待签署合同
+      if (result.hasPendingContracts) {
         // 有待签署合同，跳转到待签署列表页面
         // forceSign=true 表示必须签署后才能继续使用
         context.push(RoutePaths.pendingContracts, extra: true);
+        return;
+      }
+
+      // 2. 处理需要 KYC 的情况
+      if (result.requiresKyc) {
+        await _showKycRequiredDialog(result);
       }
     } catch (e) {
-      debugPrint('[HomeShellPage] 检查待签署合同失败: $e');
+      debugPrint('[HomeShellPage] 检查合同和KYC失败: $e');
       // 检查失败不阻止用户使用 App
     }
   }
 
+  /// 显示 KYC 必需弹窗
+  Future<void> _showKycRequiredDialog(ContractCheckResult result) async {
+    final message = result.kycMessage ??
+        '系统检测到您已认种了榴莲树，但尚未按国家法规完成实名认证，无法签署合同。请先完成实名认证后才能继续使用APP。';
+
+    await showDialog(
+      context: context,
+      barrierDismissible: false, // 不允许点击外部关闭
+      builder: (context) => WillPopScope(
+        onWillPop: () async => false, // 不允许返回键关闭
+        child: AlertDialog(
+          title: Row(
+            children: [
+              Icon(Icons.warning_amber_rounded, color: Colors.orange[700], size: 28),
+              const SizedBox(width: 8),
+              const Text('需要实名认证'),
+            ],
+          ),
+          content: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(
+                message,
+                style: const TextStyle(fontSize: 15, height: 1.5),
+              ),
+              if (result.paidOrderCount > 0) ...[
+                const SizedBox(height: 12),
+                Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color: Colors.orange.withOpacity(0.1),
+                    borderRadius: BorderRadius.circular(8),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.info_outline, color: Colors.orange[700], size: 20),
+                      const SizedBox(width: 8),
+                      Expanded(
+                        child: Text(
+                          '您有 ${result.paidOrderCount} 笔认种订单待签署合同',
+                          style: TextStyle(
+                            color: Colors.orange[800],
+                            fontSize: 14,
+                          ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ],
+            ],
+          ),
+          actions: [
+            ElevatedButton(
+              onPressed: () {
+                Navigator.of(context).pop();
+                // 跳转到 KYC 入口页面
+                context.push(RoutePaths.kycEntry);
+              },
+              style: ElevatedButton.styleFrom(
+                backgroundColor: AppColors.primary,
+                foregroundColor: Colors.white,
+                minimumSize: const Size(double.infinity, 48),
+              ),
+              child: const Text('立即认证', style: TextStyle(fontSize: 16)),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
   /// 重置合同检查状态（用于用户切换账号时）
   static void resetContractCheckState() {
     _hasCheckedContracts = false;