diff --git a/backend/go-service/app/meeting/service/meeting_lifecycle_service.go b/backend/go-service/app/meeting/service/meeting_lifecycle_service.go
index b0ff16f..9e9dc45 100644
--- a/backend/go-service/app/meeting/service/meeting_lifecycle_service.go
+++ b/backend/go-service/app/meeting/service/meeting_lifecycle_service.go
@@ -357,10 +357,50 @@ func (s *MeetingLifecycleService) HandleEmptyRoomExpired(ctx context.Context, ro
 		"room_code": roomCode,
 		"reason":    constants.MeetingEndedReasonEmptyTTL,
 	})
+
+	// Task 16 资源清理专项：空房销毁时 activeCount==0，每个前任活跃成员的 Redis Set / Hash 理论上
+	// 应已被各自的 LeaveRoom → cleanupUserResources 清掉；此处幂等兜底清理生命周期自身持有的 timer
+	// 与 handling 锁 key（避免 OnRoomEnded 缺失导致的 handle/timers 累积）
+	cleanupRoomRedisResidual(ctx, s.redis, roomCode, nil)
+	s.cancelTimer(&s.graceTimers, roomCode)
+	// empty_ttl 主 key 已经在当前函数顶部 DEL，此处再 DEL host_grace + handling 锁 key 做收尾
+	pipe := s.redis.Pipeline()
+	pipe.Del(ctx, HostGraceKey(roomCode))
+	pipe.Del(ctx, redisKeyHostGraceHandlingLock+roomCode)
+	if _, err := pipe.Exec(ctx); err != nil {
+		logs.Warn(ctx, funcName, "清理会议剩余生命周期 key 失败（忽略）",
+			zap.String("room_code", roomCode), zap.Error(err))
+	}
+
 	logs.Info(ctx, funcName, "空房 TTL 过期，会议已销毁",
 		zap.String("room_code", roomCode), zap.Int64("room_id", room.ID))
 }
 
+// OnRoomEnded 会议结束（host 主动 EndRoom / 空房 TTL 销毁 / 其他销毁路径）统一生命周期收尾
+// Task 16 资源清理专项：
+//   1. 取消 host 宽限期 / 空房 TTL 两条本地 timer，避免 time.AfterFunc 到期后跑一轮无效 HandleXxxExpired
+//      (虽然 HandleXxxExpired 内部有 status=Ended 早退路径，但仍浪费 30s context + Redis 往返)
+//   2. DEL host_grace / empty_ttl 主 key 及对应的处理锁 key，避免 Redis 条目累积到自然过期
+// 幂等：多次调用、无 timer / 无 key 场景都安全
+func (s *MeetingLifecycleService) OnRoomEnded(ctx context.Context, roomCode string) {
+	funcName := "service.meeting_lifecycle_service.OnRoomEnded"
+
+	s.cancelTimer(&s.graceTimers, roomCode)
+	s.cancelTimer(&s.emptyTTLTimers, roomCode)
+
+	pipe := s.redis.Pipeline()
+	pipe.Del(ctx, HostGraceKey(roomCode))
+	pipe.Del(ctx, EmptyTTLKey(roomCode))
+	pipe.Del(ctx, redisKeyHostGraceHandlingLock+roomCode)
+	pipe.Del(ctx, redisKeyEmptyTTLHandlingLock+roomCode)
+	if _, err := pipe.Exec(ctx); err != nil {
+		logs.Warn(ctx, funcName, "批量清理生命周期 Redis key 失败（忽略，继续）",
+			zap.String("room_code", roomCode), zap.Error(err))
+	}
+	logs.Debug(ctx, funcName, "会议结束，生命周期 timers/keys 已清理",
+		zap.String("room_code", roomCode))
+}
+
 // RescheduleFromRedis 服务启动时扫描 Redis 已存在的 grace / empty_ttl key，按剩余 PTTL 补装本地 timer
 // 服务重启后调用一次，避免重启期间 WS 断线事件的本地 timer 丢失导致宽限期/TTL 永远不触发
 func (s *MeetingLifecycleService) RescheduleFromRedis(ctx context.Context) {
diff --git a/backend/go-service/app/meeting/service/meeting_service.go b/backend/go-service/app/meeting/service/meeting_service.go
index bd8e5be..15b6697 100644
--- a/backend/go-service/app/meeting/service/meeting_service.go
+++ b/backend/go-service/app/meeting/service/meeting_service.go
@@ -575,6 +575,18 @@ func (s *MeetingService) EndRoom(ctx context.Context, userID int64, code string)
 		logs.Warn(ctx, funcName, "关闭 mediasoup Router 失败", zap.Error(err))
 	}
 
+	// Task 16 资源清理专项：EndRoom 场景下 WS 断开钩子尚未触发（用户客户端可能仍在会议页），
+	// 需主动清每个活跃成员在 Redis 的资源追踪集合 + 音视频状态 Hash，避免短期反复开会累积垃圾条目
+	userIDs := make([]int64, 0, len(activesBefore))
+	for _, p := range activesBefore {
+		userIDs = append(userIDs, p.UserID)
+	}
+	cleanupRoomRedisResidual(ctx, s.redis, code, userIDs)
+	// 取消生命周期 timer + 清 host_grace / empty_ttl / handling 锁 key（幂等）
+	if s.lifecycleSvc != nil {
+		s.lifecycleSvc.OnRoomEnded(ctx, code)
+	}
+
 	logs.Info(ctx, funcName, "会议已结束", zap.String("room_code", code), zap.Int64("host_id", userID))
 	return nil
 }
diff --git a/backend/go-service/app/meeting/service/meeting_signal_service.go b/backend/go-service/app/meeting/service/meeting_signal_service.go
index 1c25f85..8adbf01 100644
--- a/backend/go-service/app/meeting/service/meeting_signal_service.go
+++ b/backend/go-service/app/meeting/service/meeting_signal_service.go
@@ -708,3 +708,28 @@ func (s *MeetingSignalService) cleanupUserResources(ctx context.Context, roomCod
 			zap.Int("resource_count", len(members)))
 	}
 }
+
+// cleanupRoomRedisResidual 批量清理指定 roomCode 下一批用户的 Redis 资源追踪集合 + 音视频状态 Hash
+// Task 16 资源清理专项：
+//   - EndRoom / HandleEmptyRoomExpired 等会议销毁路径调用，避免正常 WS 断开钩子尚未触发就结束会议导致的残留
+//   - userIDs 为销毁前活跃成员快照；无活跃成员可传 nil/空切片，此时仅走上层 lifecycle 清理
+//   - 使用 Pipeline 减少 Redis 往返；失败仅 Warn，不阻断上层销毁流程
+//   - package 私有：允许 meeting_service / meeting_lifecycle_service 等同包文件直接调用
+func cleanupRoomRedisResidual(ctx context.Context, rdb *redis.Client, roomCode string, userIDs []int64) {
+	funcName := "service.meeting_signal_service.cleanupRoomRedisResidual"
+	if rdb == nil || len(userIDs) == 0 {
+		return
+	}
+	pipe := rdb.Pipeline()
+	for _, uid := range userIDs {
+		pipe.Del(ctx, resourceTrackKey(roomCode, uid))
+		pipe.Del(ctx, memberStateKey(roomCode, uid))
+	}
+	if _, err := pipe.Exec(ctx); err != nil {
+		logs.Warn(ctx, funcName, "批量清理用户 Redis 残留失败（忽略，继续）",
+			zap.String("room_code", roomCode), zap.Int("user_count", len(userIDs)), zap.Error(err))
+		return
+	}
+	logs.Debug(ctx, funcName, "会议销毁，用户 Redis 残留已清理",
+		zap.String("room_code", roomCode), zap.Int("user_count", len(userIDs)))
+}
diff --git a/frontend/src/pages/meeting/room.vue b/frontend/src/pages/meeting/room.vue
index 66f896a..592f438 100644
--- a/frontend/src/pages/meeting/room.vue
+++ b/frontend/src/pages/meeting/room.vue
@@ -602,6 +602,11 @@ onUnload(() => {
   if (meetingStore.isInMeeting && meetingStore.localState !== MEETING_LOCAL_STATE_LEAVING) {
     meetingStore.leave().catch(() => {})
   }
+  // Task 16 资源清理：若停留在"会议已结束"页面后物理返回，清空 pinia state
+  // 避免 currentRoom / participants / chatMessages 等大对象常驻内存
+  if (meetingStore.localState === MEETING_LOCAL_STATE_ENDED) {
+    meetingStore.exitEndedRoom()
+  }
 })
 </script>
 
diff --git a/frontend/src/store/meeting.js b/frontend/src/store/meeting.js
index ebadcbc..d9efd05 100644
--- a/frontend/src/store/meeting.js
+++ b/frontend/src/store/meeting.js
@@ -177,6 +177,12 @@ export const useMeetingStore = defineStore('meeting', () => {
   /** { [userId]: { inCount: number, outCount: number } }，用于防抖 1-in / 2-out */
   const _speakingDebounce = {}
 
+  /**
+   * Task 16 资源清理专项：_broadcastSelfState 重试期间的 setTimeout 句柄集合
+   * 离会 / 结束会议时统一 clearTimeout，避免会议结束后仍有 stale 重试逻辑在 event loop 排队
+   */
+  const _pendingBroadcastTimers = new Set()
+
   // ==================== Getters ====================
 
   const isInMeeting = computed(() => {
@@ -583,6 +589,12 @@ export const useMeetingStore = defineStore('meeting', () => {
 
   const _cleanupMedia = () => {
     _stopSpeakingDetection()
+    // Task 16 资源清理：清理 _broadcastSelfState 挂起的 setTimeout 重试
+    // 防止会议结束后重试逻辑仍在 event loop 排队造成 memory pin
+    _pendingBroadcastTimers.forEach((handle) => {
+      try { clearTimeout(handle) } catch {}
+    })
+    _pendingBroadcastTimers.clear()
     if (_engine) {
       try { _engine.close() } catch (e) { _log('warn', '_cleanupMedia engine.close', e) }
       _engine = null
@@ -927,7 +939,13 @@ export const useMeetingStore = defineStore('meeting', () => {
     }
   }
 
-  /** 主持人结束会议（会广播 room.ended 给所有人） */
+  /**
+   * 主持人结束会议（后端会广播 room.ended 给所有人）
+   * Task 16 资源清理：API 成功后立即本地兜底 _cleanupMedia
+   * - 避免"API 成功但 WS 断线导致 room.ended 广播丢失 → 本地 engine/timer/AudioContext 泄漏"
+   * - 同时触发 _onRoomEnded 走 ENDED 状态，UI 展示"会议已结束"提示页
+   * - 若之后广播到达也是幂等（_engine 已 null + closed 判定）
+   */
   const endMeeting = async () => {
     if (!currentRoom.value) return
     const code = currentRoom.value.room_code
@@ -937,7 +955,20 @@ export const useMeetingStore = defineStore('meeting', () => {
       _log('warn', '[Meeting] end API 失败', err)
       throw err
     }
-    // room.ended WS 广播会触发 _onRoomEnded 清理
+    _onRoomEnded({ data: { room_code: code, reason: 'host_ended' } })
+  }
+
+  /**
+   * Task 16 资源清理：退出"会议已结束"提示页时的清理
+   * - _onRoomEnded 刻意保留了 currentRoom / participants / chatMessages 供结束页渲染
+   * - 但若用户长时间停留在结束页（或直接 reLaunch 去别处），pinia state 会一直占内存
+   * - 调用方：room.vue 的 onUnload / 结束页"返回首页"按钮
+   * - 仅在 ENDED 状态下执行 _reset；其他状态用 leave() 通道
+   */
+  const exitEndedRoom = () => {
+    if (localState.value === MEETING_LOCAL_STATE_ENDED) {
+      _reset()
+    }
   }
 
   // ==================== Actions：本地推流 ====================
@@ -1052,7 +1083,13 @@ export const useMeetingStore = defineStore('meeting', () => {
           }
           const delay = backoffMs[attempt + 1] || 2100
           _log('warn', `[Meeting] 上报本地音视频状态失败，${delay}ms 后重试 (${attempt + 2}/${maxAttempts})`, err)
-          setTimeout(() => attemptSend(attempt + 1), delay)
+          // Task 16 资源清理：把 setTimeout 句柄登记到全局 Set
+          // 离会/结束会议时 _cleanupMedia() 统一 clearTimeout，避免 stale 重试排队
+          const handle = setTimeout(() => {
+            _pendingBroadcastTimers.delete(handle)
+            attemptSend(attempt + 1)
+          }, delay)
+          _pendingBroadcastTimers.add(handle)
         })
     }
     attemptSend(0)
@@ -1224,6 +1261,7 @@ export const useMeetingStore = defineStore('meeting', () => {
     joinAndEnter,
     leave,
     endMeeting,
+    exitEndedRoom,
 
     // media
     startLocalAudio,