diff --git a/backend/internal/ws/handler.go b/backend/internal/ws/handler.go
index 52f90e5..eb84af9 100644
--- a/backend/internal/ws/handler.go
+++ b/backend/internal/ws/handler.go
@@ -220,7 +220,7 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 				DetailLevel: msg.Payload.DetailLevel,
 				Language:    msg.Payload.Language,
 			}
-			if err := sessionMgr.UpdateConfig(context.Background(), sessionID, patch); err != nil {
+			if err := client.sessionMgr.UpdateConfig(context.Background(), sessionID, patch); err != nil {
 				errors.SendWSError(client, errors.CodeInternalError, "", err)
 				continue
 			}
@@ -229,11 +229,16 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 		case "interrupt":
 			logger.Log.Infow("interrupt received", "session", sessionID)
 
-			// 获取活跃请求 ID（实际 cancel 在 Phase 5 接入 orchestrator 后实现）
-			reqID, _ := sessionMgr.GetActiveRequestID(context.Background(), sessionID)
+			// 获取活跃请求 ID 并取消
+			reqID, _ := client.sessionMgr.GetActiveRequestID(context.Background(), sessionID)
 			if reqID != "" {
-				_ = sessionMgr.ClearActiveRequest(context.Background(), sessionID)
-				// TODO: 取消对应 context cancel func
+				client.mu.Lock()
+				if cancel, ok := client.cancelFuncs[reqID]; ok {
+					cancel()
+					delete(client.cancelFuncs, reqID)
+				}
+				client.mu.Unlock()
+				_ = client.sessionMgr.ClearActiveRequest(context.Background(), sessionID)
 			}
 
 		default:
@@ -247,6 +252,15 @@ func serveWS(c *gin.Context, sessionMgr session.Manager, orch orchestrator.Orche
 
 	close(done)
 
+	// 取消所有活跃请求
+	client.mu.Lock()
+	for reqID, cancel := range client.cancelFuncs {
+		logger.Log.Infow("canceling active request on disconnect", "session", sessionID, "request", reqID)
+		cancel()
+	}
+	client.cancelFuncs = make(map[string]context.CancelFunc)
+	client.mu.Unlock()
+
 	// 断开连接时不销毁会话，让其自然过期（支持重连恢复）
 	logger.Log.Infow("client disconnected", "session", sessionID)
 }