diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index b96d134e..56dedf70 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/UITitlePanel.cs b/SunnyUI/Controls/UITitlePanel.cs
index fdfa1bd9..dbd00dca 100644
--- a/SunnyUI/Controls/UITitlePanel.cs
+++ b/SunnyUI/Controls/UITitlePanel.cs
@@ -42,7 +42,7 @@ namespace Sunny.UI
             get => _titleHeight;
             set
             {
-                _titleHeight = value;
+                _titleHeight = Math.Max(19, value);
                 Padding = new Padding(0, value, 0, 0);
                 CalcSystemBoxPos();
                 Invalidate();
diff --git a/SunnyUI/Forms/UIForm.cs b/SunnyUI/Forms/UIForm.cs
index f9a066f1..df87e847 100644
--- a/SunnyUI/Forms/UIForm.cs
+++ b/SunnyUI/Forms/UIForm.cs
@@ -417,7 +417,7 @@ namespace Sunny.UI
             get => titleHeight;
             set
             {
-                titleHeight = Math.Max(value, 31);
+                titleHeight = Math.Max(value, 29);
                 Padding = new Padding(Padding.Left, showTitle ? titleHeight : Padding.Top, Padding.Right, Padding.Bottom);
                 Invalidate();
                 CalcSystemBoxPos();
diff --git a/SunnyUI/Frames/UIPage.cs b/SunnyUI/Frames/UIPage.cs
index e197bb20..aa65da13 100644
--- a/SunnyUI/Frames/UIPage.cs
+++ b/SunnyUI/Frames/UIPage.cs
@@ -536,7 +536,7 @@ namespace Sunny.UI
             get => titleHeight;
             set
             {
-                titleHeight = Math.Max(value, 31);
+                titleHeight = Math.Max(value, 19);
                 Padding = new Padding(Padding.Left, titleHeight, Padding.Right, Padding.Bottom);
                 CalcSystemBoxPos();
                 Invalidate();