diff --git a/backend/services/referral-service/src/application/services/referral.service.ts b/backend/services/referral-service/src/application/services/referral.service.ts
index 02969b3c..618fb54a 100644
--- a/backend/services/referral-service/src/application/services/referral.service.ts
+++ b/backend/services/referral-service/src/application/services/referral.service.ts
@@ -7,7 +7,7 @@ import {
   ReferralRelationship,
   ReferralChainService,
 } from '../../domain';
-import { EventPublisherService, LeaderboardCacheService } from '../../infrastructure';
+import { EventPublisherService } from '../../infrastructure';
 import { CreateReferralRelationshipCommand } from '../commands';
 import {
   GetUserReferralInfoQuery,
@@ -27,7 +27,6 @@ export class ReferralService {
     private readonly teamStatsRepo: ITeamStatisticsRepository,
     private readonly referralChainService: ReferralChainService,
     private readonly eventPublisher: EventPublisherService,
-    private readonly leaderboardCache: LeaderboardCacheService,
   ) {}
 
   /**
@@ -118,7 +117,6 @@ export class ReferralService {
     }
 
     const teamStats = await this.teamStatsRepo.findByUserId(query.userId);
-    const rank = await this.leaderboardCache.getUserRank(query.userId);
 
     return {
       userId: relationship.userId.toString(),
@@ -130,7 +128,7 @@ export class ReferralService {
       personalPlantingCount: teamStats?.personalPlantingCount ?? 0,
       teamPlantingCount: teamStats?.teamPlantingCount ?? 0,
       leaderboardScore: teamStats?.leaderboardScore ?? 0,
-      leaderboardRank: rank,
+      leaderboardRank: null, // 排行榜功能已移至 leaderboard-service
       createdAt: relationship.createdAt,
     };
   }