diff --git a/DM_Weight/ViewModels/BiaoDingWindowViewModel.cs b/DM_Weight/ViewModels/BiaoDingWindowViewModel.cs
index e09c6b8..26b9397 100644
--- a/DM_Weight/ViewModels/BiaoDingWindowViewModel.cs
+++ b/DM_Weight/ViewModels/BiaoDingWindowViewModel.cs
@@ -266,6 +266,7 @@ namespace DM_Weight.ViewModels
 
                     else
                     {
+                        _portUtil.Operate = false;
                         _isFinishClick = false;
                         AlertMsg alertMsg = new AlertMsg
                         {