diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index 740d06cd..6e1c29cb 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 0e98f19c..c83ab165 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/SunnyUI.Demo/Properties/Resources.Designer.cs b/SunnyUI.Demo/Properties/Resources.Designer.cs
index 8ada9c82..01908b80 100644
--- a/SunnyUI.Demo/Properties/Resources.Designer.cs
+++ b/SunnyUI.Demo/Properties/Resources.Designer.cs
@@ -19,7 +19,7 @@ namespace Sunny.UI.Demo.Properties {
     // 类通过类似于 ResGen 或 Visual Studio 的工具自动生成的。
     // 若要添加或移除成员，请编辑 .ResX 文件，然后重新运行 ResGen
     // (以 /str 作为命令选项)，或重新生成 VS 项目。
-    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "17.0.0.0")]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "16.0.0.0")]
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
     [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
     internal class Resources {
@@ -271,7 +271,7 @@ namespace Sunny.UI.Demo.Properties {
         }
         
         /// <summary>
-        ///   查找类似 20220105 的本地化字符串。
+        ///   查找类似 20220109 的本地化字符串。
         /// </summary>
         internal static string BuildDate {
             get {
diff --git a/SunnyUI.Demo/Properties/Resources.resx b/SunnyUI.Demo/Properties/Resources.resx
index 17a09aa9..7c67682a 100644
--- a/SunnyUI.Demo/Properties/Resources.resx
+++ b/SunnyUI.Demo/Properties/Resources.resx
@@ -155,7 +155,7 @@
     <value>..\Resources\brescia.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
   <data name="BuildDate" xml:space="preserve">
-    <value>20220105</value>
+    <value>20220109</value>
   </data>
   <data name="ChartDarkStyle" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\ChartDarkStyle.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
diff --git a/SunnyUI/Controls/UITextBox.cs b/SunnyUI/Controls/UITextBox.cs
index 871a3dff..0dea5400 100644
--- a/SunnyUI/Controls/UITextBox.cs
+++ b/SunnyUI/Controls/UITextBox.cs
@@ -507,7 +507,7 @@ namespace Sunny.UI
 
         private void CalcEditHeight()
         {
-            TextBox edt = new();
+            TextBox edt = new TextBox();
             edt.Font = edit.Font.DPIScaleFont();
             MinHeight = edt.PreferredHeight;
             edt.BorderStyle = BorderStyle.None;
diff --git a/SunnyUI/Style/UIDPIScale.cs b/SunnyUI/Style/UIDPIScale.cs
index b08c0f3b..411e3234 100644
--- a/SunnyUI/Style/UIDPIScale.cs
+++ b/SunnyUI/Style/UIDPIScale.cs
@@ -27,6 +27,11 @@ namespace Sunny.UI
 {
     public static class UIDPIScale
     {
+        public static float DPIScale()
+        {
+            return GDI.Graphics().DpiX / 96.0f;
+        }
+
         public static float DPIScale(this Control control)
         {
             try
@@ -57,9 +62,8 @@ namespace Sunny.UI
 
         public static float DPIScaleFontSize(this float fontSize)
         {
-            using Control control = new();
             if (UIStyles.DPIScale)
-                return fontSize / control.DPIScale();
+                return fontSize / DPIScale();
             else
                 return fontSize;
         }
@@ -69,6 +73,24 @@ namespace Sunny.UI
             return control.DPIScaleFont(font, font.Size);
         }
 
+        public static Font DPIScaleFont(this Font font)
+        {
+            if (UIStyles.DPIScale)
+            {
+                if (font.GdiCharSet == 134)
+                    return new Font(font.FontFamily, font.Size / DPIScale(), font.Style, font.Unit, font.GdiCharSet);
+                else
+                    return new Font(font.FontFamily, font.Size / DPIScale());
+            }
+            else
+            {
+                if (font.GdiCharSet == 134)
+                    return new Font(font.FontFamily, font.Size, font.Style, font.Unit, font.GdiCharSet);
+                else
+                    return new Font(font.FontFamily, font.Size);
+            }
+        }
+
         public static Font DPIScaleFont(this Control control, Font font, float fontSize)
         {
             if (UIStyles.DPIScale)
@@ -87,23 +109,10 @@ namespace Sunny.UI
             }
         }
 
-        public static Font DPIScaleFont(this Font font)
-        {
-            if (UIStyles.DPIScale)
-            {
-                using Control control = new();
-                return control.DPIScaleFont(font);
-            }
-            else
-            {
-                return font;
-            }
-        }
-
         public static void SetDPIScaleFont(this Control control)
         {
             if (!UIStyles.DPIScale) return;
-            if (!control.DPIScale().EqualsFloat(1))
+            if (!DPIScale().EqualsFloat(1))
             {
                 if (control is IStyleInterface ctrl)
                 {
diff --git a/SunnyUI/SunnyUI.csproj b/SunnyUI/SunnyUI.csproj
index a259add5..6aa2da3c 100644
--- a/SunnyUI/SunnyUI.csproj
+++ b/SunnyUI/SunnyUI.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net6.0-windows;net5.0-windows;net472;net40</TargetFrameworks>
+        <TargetFrameworks>net5.0-windows;net472;net40</TargetFrameworks>
         <LangVersion>9.0</LangVersion>
         <ProjectGuid>{AB1CB247-E20B-4CBE-B269-570ADDD96C53}</ProjectGuid>
         <UseWindowsForms>true</UseWindowsForms>