diff --git a/backend/services/admin-service/src/pricing/tree-pricing.service.ts b/backend/services/admin-service/src/pricing/tree-pricing.service.ts
index db9ae627..2f7e1bcd 100644
--- a/backend/services/admin-service/src/pricing/tree-pricing.service.ts
+++ b/backend/services/admin-service/src/pricing/tree-pricing.service.ts
@@ -2,8 +2,9 @@ import { Injectable, Logger } from '@nestjs/common';
 import { PrismaService } from '../infrastructure/persistence/prisma/prisma.service';
 
 /** 基础价常量 */
-const BASE_PRICE = 15831;
-const BASE_PORTION_PRICE = 3566; // 预种基础价：9项 floor(整棵树/5) 取整 + 余额归总部
+const BASE_PRICE = 15831; // 正式认种基础价（不变）
+const BASE_PORTION_PRICE = 1887; // 预种基础价 [2026-03-01 调整] 9项 floor(18870/10) 取整 + 总部吸收余额
+const PORTIONS_PER_TREE = 10; // [2026-03-01 调整] 5 → 10 份/棵
 
 export interface TreePricingConfigResponse {
   basePrice: number;
@@ -52,9 +53,8 @@ export class TreePricingService {
     }
 
     const totalPrice = BASE_PRICE + config.currentSupplement;
-    // 预种价格 = 基础预种价(3566) + floor(加价部分/5)
-    // 注意：3566 不是 15831/5，而是各权益项 floor(amount/5) 之和 + 总部吸收余额
-    const totalPortionPrice = BASE_PORTION_PRICE + Math.floor(config.currentSupplement / 5);
+    // 预种价格 = 基础预种价(1887) + floor(加价部分/10)
+    const totalPortionPrice = BASE_PORTION_PRICE + Math.floor(config.currentSupplement / PORTIONS_PER_TREE);
     return {
       basePrice: BASE_PRICE,
       basePortionPrice: BASE_PORTION_PRICE,
@@ -80,7 +80,6 @@ export class TreePricingService {
     operatorId: string,
   ): Promise<TreePricingConfigResponse> {
     // 允许负数（降价对冲），但总价不能低于 0
-    const BASE_PRICE = 15831;
     if (BASE_PRICE + newSupplement < 0) {
       throw new Error(`调价金额不能低于 -${BASE_PRICE}，否则总价为负`);
     }
diff --git a/backend/services/planting-service/src/infrastructure/external/tree-pricing-admin.client.ts b/backend/services/planting-service/src/infrastructure/external/tree-pricing-admin.client.ts
index 0bb76c15..a2b7a8e2 100644
--- a/backend/services/planting-service/src/infrastructure/external/tree-pricing-admin.client.ts
+++ b/backend/services/planting-service/src/infrastructure/external/tree-pricing-admin.client.ts
@@ -48,10 +48,10 @@ export class TreePricingAdminClient {
       // 安全降级：加价为 0，不影响现有业务
       return {
         basePrice: 15831,
-        basePortionPrice: 3566,
+        basePortionPrice: 1887,
         currentSupplement: 0,
         totalPrice: 15831,
-        totalPortionPrice: 3566,
+        totalPortionPrice: 1887,
         autoIncreaseEnabled: false,
         autoIncreaseAmount: 0,
         autoIncreaseIntervalDays: 0,
diff --git a/frontend/mobile-app/lib/core/services/tree_pricing_service.dart b/frontend/mobile-app/lib/core/services/tree_pricing_service.dart
index 293272df..28403ad0 100644
--- a/frontend/mobile-app/lib/core/services/tree_pricing_service.dart
+++ b/frontend/mobile-app/lib/core/services/tree_pricing_service.dart
@@ -7,7 +7,7 @@ import '../network/api_client.dart';
 /// - 正式认种总价 = basePrice + currentSupplement
 /// - 预种总价 = totalPrice / 10（取整）
 class TreePricingConfig {
-  /// 正式认种基础价（固定 18870）
+  /// 正式认种基础价（固定 15831）
   final int basePrice;
 
   /// 预种基础价（固定 1887）
@@ -48,10 +48,10 @@ class TreePricingConfig {
 
   factory TreePricingConfig.fromJson(Map<String, dynamic> json) {
     return TreePricingConfig(
-      basePrice: json['basePrice'] ?? 18870,
+      basePrice: json['basePrice'] ?? 15831,
       basePortionPrice: json['basePortionPrice'] ?? 1887,
       currentSupplement: json['currentSupplement'] ?? 0,
-      totalPrice: json['totalPrice'] ?? 18870,
+      totalPrice: json['totalPrice'] ?? 15831,
       totalPortionPrice: json['totalPortionPrice'] ?? 1887,
       autoIncreaseEnabled: json['autoIncreaseEnabled'] ?? false,
       autoIncreaseAmount: json['autoIncreaseAmount'] ?? 0,
@@ -65,10 +65,10 @@ class TreePricingConfig {
   /// 默认配置（supplement=0，与原硬编码价格一致）
   factory TreePricingConfig.defaultConfig() {
     return TreePricingConfig(
-      basePrice: 18870,
+      basePrice: 15831,
       basePortionPrice: 1887,
       currentSupplement: 0,
-      totalPrice: 18870,
+      totalPrice: 15831,
       totalPortionPrice: 1887,
       autoIncreaseEnabled: false,
       autoIncreaseAmount: 0,