diff --git a/WcfControlMonitorLib/CCallService.cs b/WcfControlMonitorLib/CCallService.cs
index bd5459a..9dccf55 100644
--- a/WcfControlMonitorLib/CCallService.cs
+++ b/WcfControlMonitorLib/CCallService.cs
@@ -1574,6 +1574,7 @@ namespace WcfControlMonitorLib
             threadAGVStatusSend = new Thread(new ThreadStart(BeginListenAgvData));    //
             threadAGVStatusSend.IsBackground = true;
             threadAGVStatusSend.Start();
+            threadAGVStatusSend.Join();
         }
         public static void EndListenPLC()
         {