diff --git a/packages/services/agent-service/src/infrastructure/repositories/agent-instance.repository.ts b/packages/services/agent-service/src/infrastructure/repositories/agent-instance.repository.ts
index 599b0d0..31dcd57 100644
--- a/packages/services/agent-service/src/infrastructure/repositories/agent-instance.repository.ts
+++ b/packages/services/agent-service/src/infrastructure/repositories/agent-instance.repository.ts
@@ -1,5 +1,5 @@
 import { Injectable } from '@nestjs/common';
-import { DataSource, Repository } from 'typeorm';
+import { DataSource, Not, Repository } from 'typeorm';
 import { AgentInstance } from '../../domain/entities/agent-instance.entity';
 
 @Injectable()
@@ -27,7 +27,8 @@ export class AgentInstanceRepository {
   }
 
   findByDingTalkUserId(dingTalkUserId: string): Promise<AgentInstance | null> {
-    return this.repo.findOne({ where: { dingTalkUserId } as any });
+    // Exclude removed instances so a rebound new instance is routed correctly
+    return this.repo.findOne({ where: { dingTalkUserId, status: Not('removed') } as any });
   }
 
   save(instance: AgentInstance): Promise<AgentInstance> {
diff --git a/packages/services/agent-service/src/interfaces/rest/controllers/agent-instance.controller.ts b/packages/services/agent-service/src/interfaces/rest/controllers/agent-instance.controller.ts
index e185cfe..3f2a005 100644
--- a/packages/services/agent-service/src/interfaces/rest/controllers/agent-instance.controller.ts
+++ b/packages/services/agent-service/src/interfaces/rest/controllers/agent-instance.controller.ts
@@ -146,6 +146,7 @@ export class AgentInstanceController {
     if (!inst) throw new NotFoundException(`Instance ${id} not found`);
     await this.deployService.removeInstance(inst);
     inst.status = 'removed';
+    inst.dingTalkUserId = null as any; // Clear DingTalk binding so the ID can be reused by a new instance
     await this.instanceRepo.save(inst);
     return { message: 'Instance removed', id };
   }