diff --git a/SunnyUI.Demo/Bin/SunnyUI.Demo.exe b/SunnyUI.Demo/Bin/SunnyUI.Demo.exe
index 558edc6a..7fb9a6c8 100644
Binary files a/SunnyUI.Demo/Bin/SunnyUI.Demo.exe and b/SunnyUI.Demo/Bin/SunnyUI.Demo.exe differ
diff --git a/SunnyUI/Controls/UICheckBox.cs b/SunnyUI/Controls/UICheckBox.cs
index ceb755e2..338b6e80 100644
--- a/SunnyUI/Controls/UICheckBox.cs
+++ b/SunnyUI/Controls/UICheckBox.cs
@@ -131,9 +131,13 @@ namespace Sunny.UI
             get => _checked;
             set
             {
-                _checked = value;
-                ValueChanged?.Invoke(this, _checked);
-                CheckedChanged?.Invoke(this, new EventArgs());
+                if (_checked != value)
+                {
+                    _checked = value;
+                    ValueChanged?.Invoke(this, _checked);
+                    CheckedChanged?.Invoke(this, new EventArgs());
+                }
+
                 Invalidate();
             }
         }