diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index eaa6f934..cc1ebdc5 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/SunnyUI.dll b/Bin/net5.0-windows/SunnyUI.dll
index 9c87c931..365a4bad 100644
Binary files a/Bin/net5.0-windows/SunnyUI.dll and b/Bin/net5.0-windows/SunnyUI.dll differ
diff --git a/Bin/netcoreapp3.1/SunnyUI.dll b/Bin/netcoreapp3.1/SunnyUI.dll
index 78a31e19..bc7ab249 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Forms/UIFormService.cs b/SunnyUI/Forms/UIFormService.cs
index 2dcdd363..233b0fb5 100644
--- a/SunnyUI/Forms/UIFormService.cs
+++ b/SunnyUI/Forms/UIFormService.cs
@@ -10,8 +10,8 @@ namespace Sunny.UI
         public static void ShowWaitForm(string desc = "系统正在处理中，请稍候...")
         {
             if (IsRun) return;
-            Instance.CreateForm(desc);
             IsRun = true;
+            Instance.CreateForm(desc);
         }
 
         public static void HideWaitForm()
@@ -55,10 +55,13 @@ namespace Sunny.UI
             thread = new Thread(delegate ()
             {
                 form = new UIWaitForm(desc);
-                Application.Run(form);
+                if (IsRun) Application.Run(form);
             });
 
-            thread.Start();
+            if (IsRun)
+                thread.Start();
+            else
+                CloseForm();
         }
 
         private void CloseForm()