diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index fb4bdc9d..b2acbd39 100644
Binary files a/Bin/net40/SunnyUI.Demo.exe and b/Bin/net40/SunnyUI.Demo.exe differ
diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index 5e470abe..a5a701ef 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 8158512f..c67fb8a4 100644
Binary files a/Bin/net5.0-windows/SunnyUI.dll and b/Bin/net5.0-windows/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/ref/SunnyUI.dll b/Bin/net5.0-windows/ref/SunnyUI.dll
index b82a14fe..9af2d1ef 100644
Binary files a/Bin/net5.0-windows/ref/SunnyUI.dll and b/Bin/net5.0-windows/ref/SunnyUI.dll differ
diff --git a/Bin/netcoreapp3.1/SunnyUI.dll b/Bin/netcoreapp3.1/SunnyUI.dll
index 3b3ae136..740809c0 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Forms/UIForm.cs b/SunnyUI/Forms/UIForm.cs
index 7d5e6b69..ff915d0c 100644
--- a/SunnyUI/Forms/UIForm.cs
+++ b/SunnyUI/Forms/UIForm.cs
@@ -30,6 +30,7 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.Drawing;
 using System.Drawing.Design;
+using System.IO;
 using System.Windows.Forms;
 
 namespace Sunny.UI
@@ -1005,7 +1006,10 @@ namespace Sunny.UI
 
             if (ShowTitleIcon && Icon != null)
             {
-                e.Graphics.DrawImage(Icon.ToBitmap(), 6, (TitleHeight - 24) / 2, 24, 24);
+                using (Image image = IconToImage(Icon))
+                {
+                    e.Graphics.DrawImage(image, 6, (TitleHeight - 24) / 2, 24, 24);
+                }
             }
 
             SizeF sf = e.Graphics.MeasureString(Text, Font);
@@ -1019,6 +1023,14 @@ namespace Sunny.UI
             }
         }
 
+        private Image IconToImage(Icon icon)
+        {
+            MemoryStream mStream = new MemoryStream();
+            icon.Save(mStream);
+            Image image = Image.FromStream(mStream);
+            return image;
+        }
+
         private bool showTitleIcon;
 
         [Description("显示标题栏图标"), Category("SunnyUI")]