diff --git a/backend/services/authorization-service/src/api/controllers/authorization.controller.ts b/backend/services/authorization-service/src/api/controllers/authorization.controller.ts
index 9593dcdd..ab826ca0 100644
--- a/backend/services/authorization-service/src/api/controllers/authorization.controller.ts
+++ b/backend/services/authorization-service/src/api/controllers/authorization.controller.ts
@@ -38,6 +38,7 @@ import {
   AuthorizationResponse,
   ApplyAuthorizationResponse,
   StickmanRankingResponse,
+  CommunityHierarchyResponse,
 } from '@/api/dto/response'
 import { CurrentUser } from '@/shared/decorators'
 import { JwtAuthGuard } from '@/shared/guards'
@@ -97,6 +98,15 @@ export class AuthorizationController {
     return await this.applicationService.getUserAuthorizations(user.accountSequence)
   }
 
+  @Get('my/community-hierarchy')
+  @ApiOperation({ summary: '获取我的社区层级（上级社区和下级社区）' })
+  @ApiResponse({ status: 200, type: CommunityHierarchyResponse })
+  async getMyCommunityHierarchy(
+    @CurrentUser() user: { userId: string; accountSequence: number },
+  ): Promise<CommunityHierarchyResponse> {
+    return await this.applicationService.getCommunityHierarchy(user.accountSequence)
+  }
+
   @Get(':id')
   @ApiOperation({ summary: '获取授权详情' })
   @ApiParam({ name: 'id', description: '授权ID' })
diff --git a/backend/services/authorization-service/src/api/dto/response/community-hierarchy.response.ts b/backend/services/authorization-service/src/api/dto/response/community-hierarchy.response.ts
new file mode 100644
index 00000000..2edf66c6
--- /dev/null
+++ b/backend/services/authorization-service/src/api/dto/response/community-hierarchy.response.ts
@@ -0,0 +1,52 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger'
+
+/**
+ * 社区简要信息
+ */
+export class CommunityInfo {
+  @ApiProperty({ description: '授权ID' })
+  authorizationId: string
+
+  @ApiProperty({ description: '账户序列号' })
+  accountSequence: number
+
+  @ApiProperty({ description: '社区名称' })
+  communityName: string
+
+  @ApiPropertyOptional({ description: '用户ID' })
+  userId?: string
+
+  @ApiProperty({ description: '是否为总部社区' })
+  isHeadquarters: boolean
+}
+
+/**
+ * 社区层级响应
+ */
+export class CommunityHierarchyResponse {
+  @ApiPropertyOptional({ description: '我的社区授权（如果有）', type: CommunityInfo })
+  myCommunity: CommunityInfo | null
+
+  @ApiProperty({ description: '上级社区（最近的，如果没有则为总部社区）', type: CommunityInfo })
+  parentCommunity: CommunityInfo
+
+  @ApiProperty({ description: '下级社区列表（最近的，按accountSequence排序）', type: [CommunityInfo] })
+  childCommunities: CommunityInfo[]
+
+  @ApiProperty({ description: '是否有上级社区（非总部）' })
+  hasParentCommunity: boolean
+
+  @ApiProperty({ description: '下级社区数量' })
+  childCommunityCount: number
+}
+
+/**
+ * 总部社区常量
+ */
+export const HEADQUARTERS_COMMUNITY: CommunityInfo = {
+  authorizationId: 'headquarters',
+  accountSequence: 0,
+  communityName: '总部社区',
+  userId: undefined,
+  isHeadquarters: true,
+}
diff --git a/backend/services/authorization-service/src/api/dto/response/index.ts b/backend/services/authorization-service/src/api/dto/response/index.ts
index 893ed171..9154a88b 100644
--- a/backend/services/authorization-service/src/api/dto/response/index.ts
+++ b/backend/services/authorization-service/src/api/dto/response/index.ts
@@ -1 +1,2 @@
 export * from './authorization.response'
+export * from './community-hierarchy.response'
diff --git a/backend/services/authorization-service/src/application/dto/community-hierarchy.dto.ts b/backend/services/authorization-service/src/application/dto/community-hierarchy.dto.ts
new file mode 100644
index 00000000..12a105c1
--- /dev/null
+++ b/backend/services/authorization-service/src/application/dto/community-hierarchy.dto.ts
@@ -0,0 +1,26 @@
+/**
+ * 社区简要信息
+ */
+export interface CommunityInfoDTO {
+  authorizationId: string
+  accountSequence: number
+  communityName: string
+  userId?: string
+  isHeadquarters: boolean
+}
+
+/**
+ * 社区层级响应 DTO
+ */
+export interface CommunityHierarchyDTO {
+  /** 我的社区授权（如果有） */
+  myCommunity: CommunityInfoDTO | null
+  /** 上级社区（最近的，如果没有则为总部社区） */
+  parentCommunity: CommunityInfoDTO
+  /** 下级社区列表（最近的） */
+  childCommunities: CommunityInfoDTO[]
+  /** 是否有上级社区（非总部） */
+  hasParentCommunity: boolean
+  /** 下级社区数量 */
+  childCommunityCount: number
+}
diff --git a/backend/services/authorization-service/src/application/dto/index.ts b/backend/services/authorization-service/src/application/dto/index.ts
index 87829299..b1333f86 100644
--- a/backend/services/authorization-service/src/application/dto/index.ts
+++ b/backend/services/authorization-service/src/application/dto/index.ts
@@ -1 +1,2 @@
 export * from './authorization.dto'
+export * from './community-hierarchy.dto'
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 796aecf4..b3ffd349 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
@@ -22,6 +22,7 @@ import {
   TeamStatistics,
 } from '@/domain/services'
 import { EventPublisherService } from '@/infrastructure/kafka'
+import { ReferralServiceClient } from '@/infrastructure/external'
 import { ApplicationError, NotFoundError } from '@/shared/exceptions'
 import {
   ApplyCommunityAuthCommand,
@@ -37,7 +38,7 @@ import {
   GrantMonthlyBypassCommand,
   ExemptLocalPercentageCheckCommand,
 } from '@/application/commands'
-import { AuthorizationDTO, StickmanRankingDTO } from '@/application/dto'
+import { AuthorizationDTO, StickmanRankingDTO, CommunityHierarchyDTO } from '@/application/dto'
 
 export const REFERRAL_REPOSITORY = Symbol('IReferralRepository')
 export const TEAM_STATISTICS_REPOSITORY = Symbol('ITeamStatisticsRepository')
@@ -57,6 +58,7 @@ export class AuthorizationApplicationService {
     @Inject(TEAM_STATISTICS_REPOSITORY)
     private readonly statsRepository: ITeamStatisticsRepository,
     private readonly eventPublisher: EventPublisherService,
+    private readonly referralServiceClient: ReferralServiceClient,
   ) {}
 
   /**
@@ -493,4 +495,130 @@ export class AuthorizationApplicationService {
       updatedAt: auth.updatedAt,
     }
   }
+
+  /**
+   * 获取用户的社区层级信息
+   * - myCommunity: 我的社区授权（如果有）
+   * - parentCommunity: 上级社区（沿推荐链往上找最近的，如果没有则返回总部社区）
+   * - childCommunities: 下级社区（在我的团队中找最近的社区）
+   */
+  async getCommunityHierarchy(accountSequence: number): Promise<CommunityHierarchyDTO> {
+    this.logger.debug(`[getCommunityHierarchy] accountSequence=${accountSequence}`)
+
+    // 1. 查询我的社区授权
+    const myCommunity = await this.authorizationRepository.findByAccountSequenceAndRoleType(
+      BigInt(accountSequence),
+      RoleType.COMMUNITY,
+    )
+
+    // 2. 获取我的祖先链（推荐链）
+    const ancestorAccountSequences = await this.referralServiceClient.getReferralChain(BigInt(accountSequence))
+    this.logger.debug(`[getCommunityHierarchy] ancestorPath: ${ancestorAccountSequences.join(',')}`)
+
+    // 3. 查找上级社区（在祖先链中找最近的有社区授权的用户）
+    let parentCommunityAuth: AuthorizationRole | null = null
+    if (ancestorAccountSequences.length > 0) {
+      const ancestorCommunities = await this.authorizationRepository.findActiveCommunityByAccountSequences(
+        ancestorAccountSequences.map((seq) => BigInt(seq)),
+      )
+
+      // 找最近的（ancestorAccountSequences 是从直接推荐人到根节点的顺序）
+      if (ancestorCommunities.length > 0) {
+        // 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) {
+            parentCommunityAuth = found
+            break
+          }
+        }
+      }
+    }
+
+    // 4. 获取我的团队成员
+    const teamMemberAccountSequences = await this.referralServiceClient.getTeamMembers(BigInt(accountSequence))
+    this.logger.debug(`[getCommunityHierarchy] teamMembers count: ${teamMemberAccountSequences.length}`)
+
+    // 5. 查找下级社区（在团队成员中找最近的有社区授权的用户）
+    // "最近" 的定义：直接下级优先，然后是下级的下级，以此类推
+    // 由于 getTeamMembers 返回的是广度优先遍历结果，可以直接使用顺序
+    let childCommunityAuths: AuthorizationRole[] = []
+    if (teamMemberAccountSequences.length > 0) {
+      const teamCommunities = await this.authorizationRepository.findActiveCommunityByAccountSequences(
+        teamMemberAccountSequences.map((seq) => BigInt(seq)),
+      )
+
+      // 只保留"最近的"下级社区
+      // 如果一个社区的上级不在我的直接团队成员中，或者其上级就是我，则它是"最近的"
+      // 简化实现：返回所有团队中的社区，前端可以根据需要过滤
+      // 但按用户要求"只计算最近的那个"，这里需要做过滤
+      // 算法：如果某个社区 A 的祖先中有另一个社区 B 也在团队中，则 A 不是最近的
+
+      const communityAccountSeqs = new Set(teamCommunities.map((c) => Number(c.userId.accountSequence)))
+
+      for (const comm of teamCommunities) {
+        // 获取这个社区成员的祖先链
+        const commAncestors = await this.referralServiceClient.getReferralChain(comm.userId.accountSequence)
+
+        // 检查这个社区是否有"更近"的祖先社区
+        let hasCloserAncestorCommunity = false
+        for (const ancestorSeq of commAncestors) {
+          // 如果祖先是我，停止检查
+          if (ancestorSeq === accountSequence) {
+            break
+          }
+          // 如果祖先也是社区且在我的团队中，则当前社区不是最近的
+          if (communityAccountSeqs.has(ancestorSeq)) {
+            hasCloserAncestorCommunity = true
+            break
+          }
+        }
+
+        if (!hasCloserAncestorCommunity) {
+          childCommunityAuths.push(comm)
+        }
+      }
+    }
+
+    // 6. 构建响应
+    const HEADQUARTERS_COMMUNITY = {
+      authorizationId: 'headquarters',
+      accountSequence: 0,
+      communityName: '总部社区',
+      userId: undefined,
+      isHeadquarters: true,
+    }
+
+    return {
+      myCommunity: myCommunity && myCommunity.status === AuthorizationStatus.AUTHORIZED
+        ? {
+            authorizationId: myCommunity.authorizationId.value,
+            accountSequence: Number(myCommunity.userId.accountSequence),
+            communityName: myCommunity.displayTitle,
+            userId: myCommunity.userId.value,
+            isHeadquarters: false,
+          }
+        : null,
+      parentCommunity: parentCommunityAuth
+        ? {
+            authorizationId: parentCommunityAuth.authorizationId.value,
+            accountSequence: Number(parentCommunityAuth.userId.accountSequence),
+            communityName: parentCommunityAuth.displayTitle,
+            userId: parentCommunityAuth.userId.value,
+            isHeadquarters: false,
+          }
+        : HEADQUARTERS_COMMUNITY,
+      childCommunities: childCommunityAuths.map((auth) => ({
+        authorizationId: auth.authorizationId.value,
+        accountSequence: Number(auth.userId.accountSequence),
+        communityName: auth.displayTitle,
+        userId: auth.userId.value,
+        isHeadquarters: false,
+      })),
+      hasParentCommunity: parentCommunityAuth !== null,
+      childCommunityCount: childCommunityAuths.length,
+    }
+  }
 }
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 c7745e37..d18be749 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
@@ -24,4 +24,8 @@ export interface IAuthorizationRoleRepository {
   findPendingByUserId(userId: UserId): Promise<AuthorizationRole[]>
   findByStatus(status: AuthorizationStatus): Promise<AuthorizationRole[]>
   delete(authorizationId: AuthorizationId): Promise<void>
+  /**
+   * 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[]>
 }
diff --git a/backend/services/authorization-service/src/infrastructure/external/referral-service.client.ts b/backend/services/authorization-service/src/infrastructure/external/referral-service.client.ts
index e138d4e7..e926b392 100644
--- a/backend/services/authorization-service/src/infrastructure/external/referral-service.client.ts
+++ b/backend/services/authorization-service/src/infrastructure/external/referral-service.client.ts
@@ -16,6 +16,24 @@ interface ReferralTeamStatsResponse {
   provinceCityDistribution: Record<string, Record<string, number>> | null;
 }
 
+/**
+ * 推荐链数据接口
+ */
+interface ReferralChainResponse {
+  accountSequence: number;
+  userId: string | null;
+  ancestorPath: string[];
+  referrerId: string | null;
+}
+
+/**
+ * 团队成员数据接口
+ */
+interface TeamMembersResponse {
+  accountSequence: number;
+  teamMembers: number[];
+}
+
 /**
  * 适配器类：将 referral-service 返回的数据转换为 authorization-service 需要的格式
  */
@@ -159,4 +177,61 @@ export class ReferralServiceClient implements ITeamStatisticsRepository, OnModul
   private createEmptyStats(userId: string, accountSequence: bigint): TeamStatistics {
     return new TeamStatisticsAdapter(userId, accountSequence, 0, null);
   }
+
+  /**
+   * 获取用户的祖先链（推荐链）
+   * 返回从直接推荐人到根节点的 accountSequence 列表
+   */
+  async getReferralChain(accountSequence: bigint): Promise<number[]> {
+    if (!this.enabled) {
+      this.logger.debug('[DISABLED] Referral service integration is disabled');
+      return [];
+    }
+
+    try {
+      this.logger.debug(`[HTTP] GET /internal/referral-chain/${accountSequence}`);
+
+      const response = await this.httpClient.get<ReferralChainResponse>(
+        `/api/v1/internal/referral-chain/${accountSequence}`,
+      );
+
+      if (!response.data || !response.data.ancestorPath) {
+        return [];
+      }
+
+      // ancestorPath 存储的是 userId (bigint string)，我们需要映射到 accountSequence
+      // 由于 referral-service 中 userId = BigInt(accountSequence)，可以直接转换
+      return response.data.ancestorPath.map((id) => Number(id));
+    } catch (error) {
+      this.logger.error(`[HTTP] Failed to get referral chain for accountSequence ${accountSequence}:`, error);
+      return [];
+    }
+  }
+
+  /**
+   * 获取用户的团队成员 accountSequence 列表
+   */
+  async getTeamMembers(accountSequence: bigint): Promise<number[]> {
+    if (!this.enabled) {
+      this.logger.debug('[DISABLED] Referral service integration is disabled');
+      return [];
+    }
+
+    try {
+      this.logger.debug(`[HTTP] GET /internal/referral-chain/${accountSequence}/team-members`);
+
+      const response = await this.httpClient.get<TeamMembersResponse>(
+        `/api/v1/internal/referral-chain/${accountSequence}/team-members`,
+      );
+
+      if (!response.data || !response.data.teamMembers) {
+        return [];
+      }
+
+      return response.data.teamMembers;
+    } catch (error) {
+      this.logger.error(`[HTTP] Failed to get team members for accountSequence ${accountSequence}:`, error);
+      return [];
+    }
+  }
 }
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 ab133826..edbf1a9f 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
@@ -176,6 +176,25 @@ export class AuthorizationRoleRepositoryImpl implements IAuthorizationRoleReposi
     })
   }
 
+  async findActiveCommunityByAccountSequences(
+    accountSequences: bigint[],
+  ): Promise<AuthorizationRole[]> {
+    if (accountSequences.length === 0) {
+      return []
+    }
+
+    const records = await this.prisma.authorizationRole.findMany({
+      where: {
+        accountSequence: { in: accountSequences },
+        roleType: RoleType.COMMUNITY,
+        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/authorization-service/test/domain-services.integration-spec.ts b/backend/services/authorization-service/test/domain-services.integration-spec.ts
index b7589165..bdedb722 100644
--- a/backend/services/authorization-service/test/domain-services.integration-spec.ts
+++ b/backend/services/authorization-service/test/domain-services.integration-spec.ts
@@ -29,6 +29,7 @@ describe('Domain Services Integration Tests', () => {
     delete: jest.fn(),
     findByAccountSequenceAndRoleType: jest.fn(),
     findByAccountSequence: jest.fn(),
+    findActiveCommunityByAccountSequences: jest.fn(),
   }
 
   const mockMonthlyAssessmentRepository: jest.Mocked<IMonthlyAssessmentRepository> = {
diff --git a/backend/services/referral-service/src/api/controllers/index.ts b/backend/services/referral-service/src/api/controllers/index.ts
index 73ce4ef2..1f005e58 100644
--- a/backend/services/referral-service/src/api/controllers/index.ts
+++ b/backend/services/referral-service/src/api/controllers/index.ts
@@ -1,4 +1,5 @@
 export * from './referral.controller';
 export * from './team-statistics.controller';
 export * from './internal-team-statistics.controller';
+export * from './internal-referral-chain.controller';
 export * from './health.controller';
diff --git a/backend/services/referral-service/src/api/controllers/internal-referral-chain.controller.ts b/backend/services/referral-service/src/api/controllers/internal-referral-chain.controller.ts
new file mode 100644
index 00000000..a561dc9a
--- /dev/null
+++ b/backend/services/referral-service/src/api/controllers/internal-referral-chain.controller.ts
@@ -0,0 +1,163 @@
+import { Controller, Get, Param, Logger, Inject, NotFoundException } from '@nestjs/common';
+import { ApiTags, ApiOperation, ApiParam, ApiResponse } from '@nestjs/swagger';
+import {
+  REFERRAL_RELATIONSHIP_REPOSITORY,
+  IReferralRelationshipRepository,
+} from '../../domain';
+
+/**
+ * 内部推荐链API - 供其他微服务调用
+ * 无需JWT认证（服务间内部通信）
+ */
+@ApiTags('Internal Referral Chain API')
+@Controller('internal/referral-chain')
+export class InternalReferralChainController {
+  private readonly logger = new Logger(InternalReferralChainController.name);
+
+  constructor(
+    @Inject(REFERRAL_RELATIONSHIP_REPOSITORY)
+    private readonly referralRepo: IReferralRelationshipRepository,
+  ) {}
+
+  /**
+   * 获取用户的祖先链（从直接推荐人到根节点）
+   */
+  @Get(':accountSequence')
+  @ApiOperation({ summary: '获取用户推荐链（内部API）' })
+  @ApiParam({ name: 'accountSequence', description: '账户序列号' })
+  @ApiResponse({
+    status: 200,
+    description: '推荐链数据',
+    schema: {
+      type: 'object',
+      properties: {
+        accountSequence: { type: 'number' },
+        userId: { type: 'string' },
+        ancestorPath: {
+          type: 'array',
+          items: { type: 'string' },
+          description: '祖先链（从直接推荐人到根节点的accountSequence列表）',
+        },
+        referrerId: { type: 'string', nullable: true },
+      },
+    },
+  })
+  async getReferralChain(@Param('accountSequence') accountSequence: string) {
+    this.logger.debug(`[INTERNAL] getReferralChain: accountSequence=${accountSequence}`);
+
+    const relationship = await this.referralRepo.findByAccountSequence(Number(accountSequence));
+
+    if (!relationship) {
+      this.logger.debug(`[INTERNAL] No referral found for accountSequence: ${accountSequence}`);
+      // 返回空的祖先链而不是抛出错误
+      return {
+        accountSequence: Number(accountSequence),
+        userId: null,
+        ancestorPath: [],
+        referrerId: null,
+      };
+    }
+
+    // ancestorPath 存储的是 userId (bigint)，需要转换为字符串
+    const ancestorPath = relationship.referralChain.map((id) => id.toString());
+
+    return {
+      accountSequence: relationship.accountSequence,
+      userId: relationship.userId.toString(),
+      ancestorPath,
+      referrerId: relationship.referrerId?.toString() ?? null,
+    };
+  }
+
+  /**
+   * 批量获取用户的祖先链
+   */
+  @Get('batch/:accountSequences')
+  @ApiOperation({ summary: '批量获取用户推荐链（内部API）' })
+  @ApiParam({ name: 'accountSequences', description: '账户序列号列表，逗号分隔' })
+  @ApiResponse({
+    status: 200,
+    description: '批量推荐链数据',
+  })
+  async getBatchReferralChains(@Param('accountSequences') accountSequences: string) {
+    const sequences = accountSequences.split(',').map((s) => Number(s.trim()));
+    this.logger.debug(`[INTERNAL] getBatchReferralChains: ${sequences.length} accounts`);
+
+    const results: Record<number, { userId: string | null; ancestorPath: string[]; referrerId: string | null }> = {};
+
+    for (const seq of sequences) {
+      const relationship = await this.referralRepo.findByAccountSequence(seq);
+      if (relationship) {
+        results[seq] = {
+          userId: relationship.userId.toString(),
+          ancestorPath: relationship.referralChain.map((id) => id.toString()),
+          referrerId: relationship.referrerId?.toString() ?? null,
+        };
+      } else {
+        results[seq] = {
+          userId: null,
+          ancestorPath: [],
+          referrerId: null,
+        };
+      }
+    }
+
+    return results;
+  }
+
+  /**
+   * 获取用户的团队成员（下级用户）的accountSequence列表
+   * 用于查找下级社区
+   */
+  @Get(':accountSequence/team-members')
+  @ApiOperation({ summary: '获取团队成员accountSequence列表（内部API）' })
+  @ApiParam({ name: 'accountSequence', description: '账户序列号' })
+  @ApiResponse({
+    status: 200,
+    description: '团队成员列表',
+    schema: {
+      type: 'object',
+      properties: {
+        accountSequence: { type: 'number' },
+        teamMembers: {
+          type: 'array',
+          items: { type: 'number' },
+          description: '团队成员accountSequence列表（直接和间接下级）',
+        },
+      },
+    },
+  })
+  async getTeamMembers(@Param('accountSequence') accountSequence: string) {
+    this.logger.debug(`[INTERNAL] getTeamMembers: accountSequence=${accountSequence}`);
+
+    const relationship = await this.referralRepo.findByAccountSequence(Number(accountSequence));
+
+    if (!relationship) {
+      return {
+        accountSequence: Number(accountSequence),
+        teamMembers: [],
+      };
+    }
+
+    // 获取所有直推用户
+    const directReferrals = await this.referralRepo.findDirectReferrals(relationship.userId);
+
+    // 递归获取所有下级成员的accountSequence
+    const teamMembers: number[] = [];
+    const queue = [...directReferrals];
+
+    while (queue.length > 0) {
+      const current = queue.shift()!;
+      teamMembers.push(current.accountSequence);
+
+      // 获取当前用户的直推
+      const subReferrals = await this.referralRepo.findDirectReferrals(current.userId);
+      queue.push(...subReferrals);
+    }
+
+    return {
+      accountSequence: Number(accountSequence),
+      teamMembers,
+    };
+  }
+}
diff --git a/backend/services/referral-service/src/modules/api.module.ts b/backend/services/referral-service/src/modules/api.module.ts
index b04e3569..4b06477a 100644
--- a/backend/services/referral-service/src/modules/api.module.ts
+++ b/backend/services/referral-service/src/modules/api.module.ts
@@ -6,6 +6,7 @@ import {
   ReferralController,
   TeamStatisticsController,
   InternalTeamStatisticsController,
+  InternalReferralChainController,
   HealthController,
 } from '../api';
 import { InternalReferralController } from '../api/controllers/referral.controller';
@@ -16,6 +17,7 @@ import { InternalReferralController } from '../api/controllers/referral.controll
     ReferralController,
     TeamStatisticsController,
     InternalTeamStatisticsController,
+    InternalReferralChainController,
     HealthController,
     InternalReferralController,
   ],
diff --git a/frontend/mobile-app/lib/core/constants/api_endpoints.dart b/frontend/mobile-app/lib/core/constants/api_endpoints.dart
index d1e2b6af..a990ffe4 100644
--- a/frontend/mobile-app/lib/core/constants/api_endpoints.dart
+++ b/frontend/mobile-app/lib/core/constants/api_endpoints.dart
@@ -78,6 +78,7 @@ class ApiEndpoints {
   // Authorization (-> Authorization Service)
   static const String authorizations = '/authorizations';
   static const String myAuthorizations = '$authorizations/my';  // 获取我的授权列表
+  static const String myCommunityHierarchy = '$authorizations/my/community-hierarchy';  // 获取社区层级
 
   // Telemetry (-> Reporting Service)
   static const String telemetry = '/telemetry';
diff --git a/frontend/mobile-app/lib/core/services/authorization_service.dart b/frontend/mobile-app/lib/core/services/authorization_service.dart
index b40f77ac..16c2f4b5 100644
--- a/frontend/mobile-app/lib/core/services/authorization_service.dart
+++ b/frontend/mobile-app/lib/core/services/authorization_service.dart
@@ -208,6 +208,69 @@ class UserAuthorizationSummary {
   }
 }
 
+/// 社区简要信息
+class CommunityInfo {
+  final String authorizationId;
+  final int accountSequence;
+  final String communityName;
+  final String? userId;
+  final bool isHeadquarters;
+
+  CommunityInfo({
+    required this.authorizationId,
+    required this.accountSequence,
+    required this.communityName,
+    this.userId,
+    required this.isHeadquarters,
+  });
+
+  factory CommunityInfo.fromJson(Map<String, dynamic> json) {
+    return CommunityInfo(
+      authorizationId: json['authorizationId'] ?? '',
+      accountSequence: json['accountSequence'] ?? 0,
+      communityName: json['communityName'] ?? '',
+      userId: json['userId'],
+      isHeadquarters: json['isHeadquarters'] ?? false,
+    );
+  }
+}
+
+/// 社区层级信息
+class CommunityHierarchy {
+  /// 我的社区授权（如果有）
+  final CommunityInfo? myCommunity;
+  /// 上级社区（最近的，如果没有则为总部社区）
+  final CommunityInfo parentCommunity;
+  /// 下级社区列表
+  final List<CommunityInfo> childCommunities;
+  /// 是否有上级社区（非总部）
+  final bool hasParentCommunity;
+  /// 下级社区数量
+  final int childCommunityCount;
+
+  CommunityHierarchy({
+    this.myCommunity,
+    required this.parentCommunity,
+    required this.childCommunities,
+    required this.hasParentCommunity,
+    required this.childCommunityCount,
+  });
+
+  factory CommunityHierarchy.fromJson(Map<String, dynamic> json) {
+    return CommunityHierarchy(
+      myCommunity: json['myCommunity'] != null
+          ? CommunityInfo.fromJson(json['myCommunity'])
+          : null,
+      parentCommunity: CommunityInfo.fromJson(json['parentCommunity']),
+      childCommunities: (json['childCommunities'] as List<dynamic>?)
+          ?.map((e) => CommunityInfo.fromJson(e as Map<String, dynamic>))
+          .toList() ?? [],
+      hasParentCommunity: json['hasParentCommunity'] ?? false,
+      childCommunityCount: json['childCommunityCount'] ?? 0,
+    );
+  }
+}
+
 /// 授权服务
 ///
 /// 处理用户授权相关功能:
@@ -261,4 +324,40 @@ class AuthorizationService {
     final authorizations = await getMyAuthorizations();
     return UserAuthorizationSummary.fromList(authorizations);
   }
+
+  /// 获取我的社区层级信息
+  ///
+  /// 返回上级社区（如果没有则为总部社区）和下级社区列表
+  /// 调用 GET /authorizations/my/community-hierarchy
+  Future<CommunityHierarchy> getMyCommunityHierarchy() async {
+    try {
+      debugPrint('获取社区层级...');
+      final response = await _apiClient.get(ApiEndpoints.myCommunityHierarchy);
+
+      if (response.statusCode == 200) {
+        final responseData = response.data;
+        // API 返回格式: {"success": true, "data": {...}}
+        Map<String, dynamic>? data;
+        if (responseData is Map<String, dynamic>) {
+          if (responseData.containsKey('data')) {
+            data = responseData['data'] as Map<String, dynamic>?;
+          } else {
+            data = responseData;
+          }
+        }
+
+        if (data != null) {
+          final hierarchy = CommunityHierarchy.fromJson(data);
+          debugPrint('社区层级获取成功: 上级=${hierarchy.parentCommunity.communityName}, 下级数量=${hierarchy.childCommunityCount}');
+          return hierarchy;
+        }
+        throw Exception('社区层级数据格式错误');
+      }
+
+      throw Exception('获取社区层级失败');
+    } catch (e) {
+      debugPrint('获取社区层级失败: $e');
+      rethrow;
+    }
+  }
 }