diff --git a/backend/services/authorization-service/src/api/controllers/index.ts b/backend/services/authorization-service/src/api/controllers/index.ts
index c12cb097..11d61abb 100644
--- a/backend/services/authorization-service/src/api/controllers/index.ts
+++ b/backend/services/authorization-service/src/api/controllers/index.ts
@@ -1,3 +1,4 @@
 export * from './authorization.controller'
 export * from './admin-authorization.controller'
 export * from './health.controller'
+export * from './internal-authorization.controller'
diff --git a/backend/services/authorization-service/src/api/controllers/internal-authorization.controller.ts b/backend/services/authorization-service/src/api/controllers/internal-authorization.controller.ts
new file mode 100644
index 00000000..859ab295
--- /dev/null
+++ b/backend/services/authorization-service/src/api/controllers/internal-authorization.controller.ts
@@ -0,0 +1,118 @@
+import { Controller, Get, Query, Logger } from '@nestjs/common'
+import { ApiTags, ApiOperation, ApiQuery, ApiResponse } from '@nestjs/swagger'
+import { AuthorizationApplicationService } from '@/application/services'
+
+/**
+ * 内部授权 API - 供其他微服务调用
+ * 无需 JWT 认证（服务间内部通信）
+ */
+@ApiTags('Internal Authorization API')
+@Controller('authorization')
+export class InternalAuthorizationController {
+  private readonly logger = new Logger(InternalAuthorizationController.name)
+
+  constructor(private readonly applicationService: AuthorizationApplicationService) {}
+
+  /**
+   * 查找用户推荐链中最近的社区授权用户
+   * 用于 reward-service 分配社区权益
+   */
+  @Get('nearest-community')
+  @ApiOperation({ summary: '查找最近的社区授权用户（内部 API）' })
+  @ApiQuery({ name: 'accountSequence', description: '用户的 accountSequence' })
+  @ApiResponse({
+    status: 200,
+    description: '返回最近社区授权用户的 accountSequence，如果没有则返回 null',
+    schema: {
+      type: 'object',
+      properties: {
+        accountSequence: { type: 'number', nullable: true },
+      },
+    },
+  })
+  async findNearestCommunity(
+    @Query('accountSequence') accountSequence: string,
+  ): Promise<{ accountSequence: number | null }> {
+    this.logger.debug(`[INTERNAL] findNearestCommunity: accountSequence=${accountSequence}`)
+
+    const result = await this.applicationService.findNearestAuthorizedCommunity(
+      Number(accountSequence),
+    )
+
+    return {
+      accountSequence: result ? Number(result) : null,
+    }
+  }
+
+  /**
+   * 查找用户推荐链中最近的省公司授权用户（匹配指定省份）
+   * 用于 reward-service 分配省团队权益
+   */
+  @Get('nearest-province')
+  @ApiOperation({ summary: '查找最近的省公司授权用户（内部 API）' })
+  @ApiQuery({ name: 'accountSequence', description: '用户的 accountSequence' })
+  @ApiQuery({ name: 'provinceCode', description: '省份代码' })
+  @ApiResponse({
+    status: 200,
+    description: '返回最近省公司授权用户的 accountSequence，如果没有则返回 null',
+    schema: {
+      type: 'object',
+      properties: {
+        accountSequence: { type: 'number', nullable: true },
+      },
+    },
+  })
+  async findNearestProvince(
+    @Query('accountSequence') accountSequence: string,
+    @Query('provinceCode') provinceCode: string,
+  ): Promise<{ accountSequence: number | null }> {
+    this.logger.debug(
+      `[INTERNAL] findNearestProvince: accountSequence=${accountSequence}, provinceCode=${provinceCode}`,
+    )
+
+    const result = await this.applicationService.findNearestAuthorizedProvince(
+      Number(accountSequence),
+      provinceCode,
+    )
+
+    return {
+      accountSequence: result ? Number(result) : null,
+    }
+  }
+
+  /**
+   * 查找用户推荐链中最近的市公司授权用户（匹配指定城市）
+   * 用于 reward-service 分配市团队权益
+   */
+  @Get('nearest-city')
+  @ApiOperation({ summary: '查找最近的市公司授权用户（内部 API）' })
+  @ApiQuery({ name: 'accountSequence', description: '用户的 accountSequence' })
+  @ApiQuery({ name: 'cityCode', description: '城市代码' })
+  @ApiResponse({
+    status: 200,
+    description: '返回最近市公司授权用户的 accountSequence，如果没有则返回 null',
+    schema: {
+      type: 'object',
+      properties: {
+        accountSequence: { type: 'number', nullable: true },
+      },
+    },
+  })
+  async findNearestCity(
+    @Query('accountSequence') accountSequence: string,
+    @Query('cityCode') cityCode: string,
+  ): Promise<{ accountSequence: number | null }> {
+    this.logger.debug(
+      `[INTERNAL] findNearestCity: accountSequence=${accountSequence}, cityCode=${cityCode}`,
+    )
+
+    const result = await this.applicationService.findNearestAuthorizedCity(
+      Number(accountSequence),
+      cityCode,
+    )
+
+    return {
+      accountSequence: result ? Number(result) : null,
+    }
+  }
+}
diff --git a/backend/services/authorization-service/src/app.module.ts b/backend/services/authorization-service/src/app.module.ts
index 7f5a277f..8dd3ec3e 100644
--- a/backend/services/authorization-service/src/app.module.ts
+++ b/backend/services/authorization-service/src/app.module.ts
@@ -27,7 +27,12 @@ import { AuthorizationApplicationService, REFERRAL_REPOSITORY, TEAM_STATISTICS_R
 import { MonthlyAssessmentScheduler } from '@/application/schedulers'
 
 // API
-import { AuthorizationController, AdminAuthorizationController, HealthController } from '@/api/controllers'
+import {
+  AuthorizationController,
+  AdminAuthorizationController,
+  HealthController,
+  InternalAuthorizationController,
+} from '@/api/controllers'
 
 // Shared
 import { JwtStrategy } from '@/shared/strategies'
@@ -59,7 +64,13 @@ const MockReferralRepository = {
     RedisModule,
     KafkaModule,
   ],
-  controllers: [AuthorizationController, AdminAuthorizationController, HealthController, EventConsumerController],
+  controllers: [
+    AuthorizationController,
+    AdminAuthorizationController,
+    HealthController,
+    InternalAuthorizationController,
+    EventConsumerController,
+  ],
   providers: [
     // Prisma
     PrismaService,
diff --git a/backend/services/authorization-service/src/application/services/authorization-application.service.ts b/backend/services/authorization-service/src/application/services/authorization-application.service.ts
index b3ffd349..a0360184 100644
--- a/backend/services/authorization-service/src/application/services/authorization-application.service.ts
+++ b/backend/services/authorization-service/src/application/services/authorization-application.service.ts
@@ -621,4 +621,127 @@ export class AuthorizationApplicationService {
       childCommunityCount: childCommunityAuths.length,
     }
   }
+
+  /**
+   * 查找用户推荐链中最近的社区授权用户
+   * 用于 reward-service 分配社区权益
+   * @returns accountSequence of nearest community authorization holder, or null
+   */
+  async findNearestAuthorizedCommunity(accountSequence: number): Promise<bigint | null> {
+    this.logger.debug(`[findNearestAuthorizedCommunity] accountSequence=${accountSequence}`)
+
+    // 获取用户的祖先链（推荐链）
+    const ancestorAccountSequences = await this.referralServiceClient.getReferralChain(BigInt(accountSequence))
+
+    if (ancestorAccountSequences.length === 0) {
+      return null
+    }
+
+    // 在祖先链中找最近的有社区授权的用户
+    const ancestorCommunities = await this.authorizationRepository.findActiveCommunityByAccountSequences(
+      ancestorAccountSequences.map((seq) => BigInt(seq)),
+    )
+
+    if (ancestorCommunities.length === 0) {
+      return null
+    }
+
+    // 按祖先链顺序找第一个匹配的
+    for (const ancestorSeq of ancestorAccountSequences) {
+      const found = ancestorCommunities.find(
+        (auth) => Number(auth.userId.accountSequence) === ancestorSeq,
+      )
+      if (found) {
+        return found.userId.accountSequence
+      }
+    }
+
+    return null
+  }
+
+  /**
+   * 查找用户推荐链中最近的省公司授权用户（匹配指定省份）
+   * 用于 reward-service 分配省团队权益
+   * @returns accountSequence of nearest province authorization holder, or null
+   */
+  async findNearestAuthorizedProvince(
+    accountSequence: number,
+    provinceCode: string,
+  ): Promise<bigint | null> {
+    this.logger.debug(
+      `[findNearestAuthorizedProvince] accountSequence=${accountSequence}, provinceCode=${provinceCode}`,
+    )
+
+    // 获取用户的祖先链（推荐链）
+    const ancestorAccountSequences = await this.referralServiceClient.getReferralChain(BigInt(accountSequence))
+
+    if (ancestorAccountSequences.length === 0) {
+      return null
+    }
+
+    // 在祖先链中找最近的有省公司授权且匹配省份代码的用户
+    const ancestorProvinces = await this.authorizationRepository.findActiveProvinceByAccountSequencesAndRegion(
+      ancestorAccountSequences.map((seq) => BigInt(seq)),
+      provinceCode,
+    )
+
+    if (ancestorProvinces.length === 0) {
+      return null
+    }
+
+    // 按祖先链顺序找第一个匹配的
+    for (const ancestorSeq of ancestorAccountSequences) {
+      const found = ancestorProvinces.find(
+        (auth) => Number(auth.userId.accountSequence) === ancestorSeq,
+      )
+      if (found) {
+        return found.userId.accountSequence
+      }
+    }
+
+    return null
+  }
+
+  /**
+   * 查找用户推荐链中最近的市公司授权用户（匹配指定城市）
+   * 用于 reward-service 分配市团队权益
+   * @returns accountSequence of nearest city authorization holder, or null
+   */
+  async findNearestAuthorizedCity(
+    accountSequence: number,
+    cityCode: string,
+  ): Promise<bigint | null> {
+    this.logger.debug(
+      `[findNearestAuthorizedCity] accountSequence=${accountSequence}, cityCode=${cityCode}`,
+    )
+
+    // 获取用户的祖先链（推荐链）
+    const ancestorAccountSequences = await this.referralServiceClient.getReferralChain(BigInt(accountSequence))
+
+    if (ancestorAccountSequences.length === 0) {
+      return null
+    }
+
+    // 在祖先链中找最近的有市公司授权且匹配城市代码的用户
+    const ancestorCities = await this.authorizationRepository.findActiveCityByAccountSequencesAndRegion(
+      ancestorAccountSequences.map((seq) => BigInt(seq)),
+      cityCode,
+    )
+
+    if (ancestorCities.length === 0) {
+      return null
+    }
+
+    // 按祖先链顺序找第一个匹配的
+    for (const ancestorSeq of ancestorAccountSequences) {
+      const found = ancestorCities.find(
+        (auth) => Number(auth.userId.accountSequence) === ancestorSeq,
+      )
+      if (found) {
+        return found.userId.accountSequence
+      }
+    }
+
+    return null
+  }
 }
diff --git a/backend/services/authorization-service/src/domain/repositories/authorization-role.repository.ts b/backend/services/authorization-service/src/domain/repositories/authorization-role.repository.ts
index d18be749..582054f3 100644
--- a/backend/services/authorization-service/src/domain/repositories/authorization-role.repository.ts
+++ b/backend/services/authorization-service/src/domain/repositories/authorization-role.repository.ts
@@ -28,4 +28,18 @@ export interface IAuthorizationRoleRepository {
    * 批量查询指定 accountSequence 列表中具有活跃社区授权的用户
    */
   findActiveCommunityByAccountSequences(accountSequences: bigint[]): Promise<AuthorizationRole[]>
+  /**
+   * 批量查询指定 accountSequence 列表中具有活跃省公司授权（且匹配省份代码）的用户
+   */
+  findActiveProvinceByAccountSequencesAndRegion(
+    accountSequences: bigint[],
+    provinceCode: string,
+  ): Promise<AuthorizationRole[]>
+  /**
+   * 批量查询指定 accountSequence 列表中具有活跃市公司授权（且匹配城市代码）的用户
+   */
+  findActiveCityByAccountSequencesAndRegion(
+    accountSequences: bigint[],
+    cityCode: string,
+  ): Promise<AuthorizationRole[]>
 }
diff --git a/backend/services/authorization-service/src/infrastructure/persistence/repositories/authorization-role.repository.impl.ts b/backend/services/authorization-service/src/infrastructure/persistence/repositories/authorization-role.repository.impl.ts
index edbf1a9f..143927b2 100644
--- a/backend/services/authorization-service/src/infrastructure/persistence/repositories/authorization-role.repository.impl.ts
+++ b/backend/services/authorization-service/src/infrastructure/persistence/repositories/authorization-role.repository.impl.ts
@@ -195,6 +195,48 @@ export class AuthorizationRoleRepositoryImpl implements IAuthorizationRoleReposi
     return records.map((record) => this.toDomain(record))
   }
 
+  async findActiveProvinceByAccountSequencesAndRegion(
+    accountSequences: bigint[],
+    provinceCode: string,
+  ): Promise<AuthorizationRole[]> {
+    if (accountSequences.length === 0) {
+      return []
+    }
+
+    const records = await this.prisma.authorizationRole.findMany({
+      where: {
+        accountSequence: { in: accountSequences },
+        roleType: RoleType.PROVINCE_COMPANY,
+        regionCode: provinceCode,
+        status: AuthorizationStatus.AUTHORIZED,
+        benefitActive: true,
+      },
+      orderBy: { accountSequence: 'asc' },
+    })
+    return records.map((record) => this.toDomain(record))
+  }
+
+  async findActiveCityByAccountSequencesAndRegion(
+    accountSequences: bigint[],
+    cityCode: string,
+  ): Promise<AuthorizationRole[]> {
+    if (accountSequences.length === 0) {
+      return []
+    }
+
+    const records = await this.prisma.authorizationRole.findMany({
+      where: {
+        accountSequence: { in: accountSequences },
+        roleType: RoleType.CITY_COMPANY,
+        regionCode: cityCode,
+        status: AuthorizationStatus.AUTHORIZED,
+        benefitActive: true,
+      },
+      orderBy: { accountSequence: 'asc' },
+    })
+    return records.map((record) => this.toDomain(record))
+  }
+
   private toDomain(record: any): AuthorizationRole {
     const props: AuthorizationRoleProps = {
       authorizationId: AuthorizationId.create(record.id),
diff --git a/backend/services/referral-service/src/api/controllers/referral.controller.ts b/backend/services/referral-service/src/api/controllers/referral.controller.ts
index f6ec4d93..13a03a5e 100644
--- a/backend/services/referral-service/src/api/controllers/referral.controller.ts
+++ b/backend/services/referral-service/src/api/controllers/referral.controller.ts
@@ -8,6 +8,7 @@ import {
   UseGuards,
   HttpCode,
   HttpStatus,
+  Inject,
 } from '@nestjs/common';
 import {
   ApiTags,
@@ -29,11 +30,23 @@ import {
 } from '../dto';
 import { CreateReferralRelationshipCommand } from '../../application/commands';
 import { GetUserReferralInfoQuery, GetDirectReferralsQuery } from '../../application/queries';
+import {
+  REFERRAL_RELATIONSHIP_REPOSITORY,
+  IReferralRelationshipRepository,
+  TEAM_STATISTICS_REPOSITORY,
+  ITeamStatisticsRepository,
+} from '../../domain';
 
 @ApiTags('Referral')
 @Controller('referral')
 export class ReferralController {
-  constructor(private readonly referralService: ReferralService) {}
+  constructor(
+    private readonly referralService: ReferralService,
+    @Inject(REFERRAL_RELATIONSHIP_REPOSITORY)
+    private readonly referralRepo: IReferralRelationshipRepository,
+    @Inject(TEAM_STATISTICS_REPOSITORY)
+    private readonly teamStatsRepo: ITeamStatisticsRepository,
+  ) {}
 
   @Get('me')
   @UseGuards(JwtAuthGuard)
@@ -82,6 +95,58 @@ export class ReferralController {
     };
   }
 
+  /**
+   * 获取用户的推荐链（内部API，供 reward-service 调用）
+   * 返回直接推荐人及其认种状态
+   */
+  @Get('chain/:userId')
+  @ApiOperation({ summary: '获取用户推荐链（内部API）' })
+  @ApiParam({ name: 'userId', description: '用户ID' })
+  @ApiResponse({
+    status: 200,
+    description: '推荐链数据',
+    schema: {
+      type: 'object',
+      properties: {
+        ancestors: {
+          type: 'array',
+          items: {
+            type: 'object',
+            properties: {
+              userId: { type: 'string' },
+              hasPlanted: { type: 'boolean' },
+            },
+          },
+        },
+      },
+    },
+  })
+  async getReferralChainForReward(
+    @Param('userId') userId: string,
+  ): Promise<{ ancestors: Array<{ userId: bigint; hasPlanted: boolean }> }> {
+    const userIdBigInt = BigInt(userId);
+
+    // 获取用户的推荐关系
+    const relationship = await this.referralRepo.findByUserId(userIdBigInt);
+    if (!relationship || !relationship.referrerId) {
+      return { ancestors: [] };
+    }
+
+    // 获取直接推荐人的认种状态
+    const referrerId = relationship.referrerId;
+    const referrerStats = await this.teamStatsRepo.findByUserId(referrerId);
+    const hasPlanted = referrerStats ? referrerStats.personalPlantingCount > 0 : false;
+
+    return {
+      ancestors: [
+        {
+          userId: referrerId,
+          hasPlanted,
+        },
+      ],
+    };
+  }
+
   @Post()
   @ApiOperation({ summary: '创建推荐关系 (内部接口)' })
   @ApiResponse({ status: 201, description: '创建成功' })
diff --git a/backend/services/reward-service/src/infrastructure/external/authorization-service/authorization-service.client.ts b/backend/services/reward-service/src/infrastructure/external/authorization-service/authorization-service.client.ts
index 27bd54d2..aaaa5ac3 100644
--- a/backend/services/reward-service/src/infrastructure/external/authorization-service/authorization-service.client.ts
+++ b/backend/services/reward-service/src/infrastructure/external/authorization-service/authorization-service.client.ts
@@ -14,7 +14,7 @@ export class AuthorizationServiceClient implements IAuthorizationServiceClient {
   async findNearestAuthorizedProvince(userId: bigint, provinceCode: string): Promise<bigint | null> {
     try {
       const response = await fetch(
-        `${this.baseUrl}/authorization/nearest-province?userId=${userId}&provinceCode=${provinceCode}`,
+        `${this.baseUrl}/authorization/nearest-province?accountSequence=${userId}&provinceCode=${provinceCode}`,
       );
 
       if (!response.ok) {
@@ -23,7 +23,7 @@ export class AuthorizationServiceClient implements IAuthorizationServiceClient {
       }
 
       const data = await response.json();
-      return data.userId ? BigInt(data.userId) : null;
+      return data.accountSequence ? BigInt(data.accountSequence) : null;
     } catch (error) {
       this.logger.error(`Error finding nearest authorized province:`, error);
       return null;
@@ -33,7 +33,7 @@ export class AuthorizationServiceClient implements IAuthorizationServiceClient {
   async findNearestAuthorizedCity(userId: bigint, cityCode: string): Promise<bigint | null> {
     try {
       const response = await fetch(
-        `${this.baseUrl}/authorization/nearest-city?userId=${userId}&cityCode=${cityCode}`,
+        `${this.baseUrl}/authorization/nearest-city?accountSequence=${userId}&cityCode=${cityCode}`,
       );
 
       if (!response.ok) {
@@ -42,7 +42,7 @@ export class AuthorizationServiceClient implements IAuthorizationServiceClient {
       }
 
       const data = await response.json();
-      return data.userId ? BigInt(data.userId) : null;
+      return data.accountSequence ? BigInt(data.accountSequence) : null;
     } catch (error) {
       this.logger.error(`Error finding nearest authorized city:`, error);
       return null;
@@ -52,7 +52,7 @@ export class AuthorizationServiceClient implements IAuthorizationServiceClient {
   async findNearestCommunity(userId: bigint): Promise<bigint | null> {
     try {
       const response = await fetch(
-        `${this.baseUrl}/authorization/nearest-community?userId=${userId}`,
+        `${this.baseUrl}/authorization/nearest-community?accountSequence=${userId}`,
       );
 
       if (!response.ok) {
@@ -61,7 +61,7 @@ export class AuthorizationServiceClient implements IAuthorizationServiceClient {
       }
 
       const data = await response.json();
-      return data.userId ? BigInt(data.userId) : null;
+      return data.accountSequence ? BigInt(data.accountSequence) : null;
     } catch (error) {
       this.logger.error(`Error finding nearest community:`, error);
       return null;