diff --git a/backend/services/planting-service/src/pre-planting/application/services/pre-planting-reward.service.ts b/backend/services/planting-service/src/pre-planting/application/services/pre-planting-reward.service.ts
index b2c92ba9..188f71eb 100644
--- a/backend/services/planting-service/src/pre-planting/application/services/pre-planting-reward.service.ts
+++ b/backend/services/planting-service/src/pre-planting/application/services/pre-planting-reward.service.ts
@@ -196,9 +196,9 @@ export class PrePlantingRewardService {
     ] = await Promise.all([
       this.referralClient.getReferralChain(accountSequence),
       this.authorizationClient.getCommunityDistribution(accountSequence),
-      this.authorizationClient.getProvinceAreaDistribution(provinceCode),
+      this.authorizationClient.getProvinceAreaDistribution(provinceCode, portionCount),
       this.authorizationClient.getProvinceTeamDistribution(accountSequence),
-      this.authorizationClient.getCityAreaDistribution(cityCode),
+      this.authorizationClient.getCityAreaDistribution(cityCode, portionCount),
       this.authorizationClient.getCityTeamDistribution(accountSequence),
     ]);
 
diff --git a/backend/services/planting-service/src/pre-planting/infrastructure/external/pre-planting-authorization.client.ts b/backend/services/planting-service/src/pre-planting/infrastructure/external/pre-planting-authorization.client.ts
index cf072015..926aadae 100644
--- a/backend/services/planting-service/src/pre-planting/infrastructure/external/pre-planting-authorization.client.ts
+++ b/backend/services/planting-service/src/pre-planting/infrastructure/external/pre-planting-authorization.client.ts
@@ -9,6 +9,16 @@ export interface RewardDistributionResult {
   isFallback: boolean;
 }
 
+/**
+ * authorization-service 省/市区域 API 返回的 distributions 数组项
+ */
+interface AreaDistributionItem {
+  accountSequence: string;
+  treeCount: number;
+  reason: string;
+  isSystemAccount: boolean;
+}
+
 @Injectable()
 export class PrePlantingAuthorizationClient {
   private readonly logger = new Logger(PrePlantingAuthorizationClient.name);
@@ -53,19 +63,39 @@ export class PrePlantingAuthorizationClient {
 
   /**
    * 省区域权益分配对象
+   *
+   * [2026-02-28] 修复：
+   * 1. 传 treeCount 参数（authorization-service 必需，用于省公司月度考核累计）
+   * 2. 正确解析 { distributions: [{accountSequence, ...}] } 返回格式（之前错误地期望 { accountSequence }）
+   * 3. fallback 路径添加 padStart(6,'0')，确保生成 7 位标准格式（如 9440000 而非 944）
    */
   async getProvinceAreaDistribution(
     provinceCode: string,
+    portionCount: number = 1,
   ): Promise<RewardDistributionResult> {
     try {
       const response = await firstValueFrom(
-        this.httpService.get<{ accountSequence: string }>(
+        this.httpService.get<{ distributions: AreaDistributionItem[] }>(
           `${this.baseUrl}/internal/authorization/province-area-reward-distribution`,
-          { params: { provinceCode } },
+          { params: { provinceCode, treeCount: portionCount } },
         ),
       );
+
+      const distributions = response.data.distributions;
+      if (!distributions || distributions.length === 0) {
+        throw new Error('Empty distributions returned');
+      }
+
+      // 预种不拆分金额，取第一个分配对象的 accountSequence
+      // 如果跨考核达标点有多个 distribution，优先取非系统账户（即省公司）
+      const target = distributions.find(d => !d.isSystemAccount) || distributions[0];
+
+      this.logger.debug(
+        `Province area distribution for ${provinceCode}: ${target.accountSequence} (${target.reason})`,
+      );
+
       return {
-        recipientAccountSequence: response.data.accountSequence,
+        recipientAccountSequence: target.accountSequence,
         isFallback: false,
       };
     } catch (error) {
@@ -73,7 +103,7 @@ export class PrePlantingAuthorizationClient {
         `Failed to get province area distribution for ${provinceCode}, fallback to system province account`,
       );
       return {
-        recipientAccountSequence: `9${provinceCode}`,
+        recipientAccountSequence: `9${provinceCode.padStart(6, '0')}`,
         isFallback: true,
       };
     }
@@ -109,19 +139,38 @@ export class PrePlantingAuthorizationClient {
 
   /**
    * 市区域权益分配对象
+   *
+   * [2026-02-28] 修复：与省区域同样的三个问题
+   * 1. 传 treeCount 参数
+   * 2. 正确解析 { distributions: [...] } 返回格式
+   * 3. fallback 路径添加 padStart(6,'0')，确保生成 7 位标准格式（如 8440100 而非 84401）
    */
   async getCityAreaDistribution(
     cityCode: string,
+    portionCount: number = 1,
   ): Promise<RewardDistributionResult> {
     try {
       const response = await firstValueFrom(
-        this.httpService.get<{ accountSequence: string }>(
+        this.httpService.get<{ distributions: AreaDistributionItem[] }>(
           `${this.baseUrl}/internal/authorization/city-area-reward-distribution`,
-          { params: { cityCode } },
+          { params: { cityCode, treeCount: portionCount } },
         ),
       );
+
+      const distributions = response.data.distributions;
+      if (!distributions || distributions.length === 0) {
+        throw new Error('Empty distributions returned');
+      }
+
+      // 预种不拆分金额，取第一个分配对象的 accountSequence
+      const target = distributions.find(d => !d.isSystemAccount) || distributions[0];
+
+      this.logger.debug(
+        `City area distribution for ${cityCode}: ${target.accountSequence} (${target.reason})`,
+      );
+
       return {
-        recipientAccountSequence: response.data.accountSequence,
+        recipientAccountSequence: target.accountSequence,
         isFallback: false,
       };
     } catch (error) {
@@ -129,7 +178,7 @@ export class PrePlantingAuthorizationClient {
         `Failed to get city area distribution for ${cityCode}, fallback to system city account`,
       );
       return {
-        recipientAccountSequence: `8${cityCode}`,
+        recipientAccountSequence: `8${cityCode.padStart(6, '0')}`,
         isFallback: true,
       };
     }