diff --git a/Bin/SunnyUI.dll b/Bin/SunnyUI.dll
index 50a0d96c..76cc7b01 100644
Binary files a/Bin/SunnyUI.dll and b/Bin/SunnyUI.dll differ
diff --git a/Bin/SunnyUI.pdb b/Bin/SunnyUI.pdb
index 24c9e447..40c4c943 100644
Binary files a/Bin/SunnyUI.pdb and b/Bin/SunnyUI.pdb differ
diff --git a/SunnyUI.Demo/Bin/SunnyUI.dll b/SunnyUI.Demo/Bin/SunnyUI.dll
index 50a0d96c..76cc7b01 100644
Binary files a/SunnyUI.Demo/Bin/SunnyUI.dll and b/SunnyUI.Demo/Bin/SunnyUI.dll differ
diff --git a/SunnyUI/Forms/UIForm.cs b/SunnyUI/Forms/UIForm.cs
index 057b9abf..20bff713 100644
--- a/SunnyUI/Forms/UIForm.cs
+++ b/SunnyUI/Forms/UIForm.cs
@@ -45,8 +45,6 @@ namespace Sunny.UI
         {
             InitializeComponent();
 
-            base.BackColor = UIColor.LightBlue;
-
             if (this.Register())
             {
                 SetStyle(UIStyles.Style);
@@ -55,13 +53,7 @@ namespace Sunny.UI
             SetStyle(ControlStyles.UserPaint, true);
             SetStyle(ControlStyles.AllPaintingInWmPaint, true);
             SetStyle(ControlStyles.DoubleBuffer, true);
-            base.DoubleBuffered = true;
-            Padding = new Padding(0, titleHeight, 0, 0);
             UpdateStyles();
-
-            base.Font = UIFontColor.Font;
-            FormBorderStyle = FormBorderStyle.None;
-            StartPosition = FormStartPosition.CenterScreen;
             Version = UIGlobal.Version;
         }
 
@@ -147,10 +139,10 @@ namespace Sunny.UI
                 }
             }
 
-            // if (ShowTitle && e.Control.Top < TitleHeight)
-            // {
-            //     e.Control.Top = TitleHeight;
-            // }
+            if (e.Control.Top < TitleHeight)
+            {
+                e.Control.Top = Padding.Top;
+            }
         }
 
         [DefaultValue(null)]
@@ -283,9 +275,10 @@ namespace Sunny.UI
             get => titleHeight;
             set
             {
-                titleHeight = Math.Max(value, 0);
-                CalcSystemBoxPos();
+                titleHeight = Math.Max(value, 31);
+                Padding = new Padding(0, showTitle ? titleHeight : 0, 0, 0);
                 Invalidate();
+                CalcSystemBoxPos();
             }
         }
 
@@ -850,7 +843,7 @@ namespace Sunny.UI
                     e.Graphics.DrawLine(Color.White,
                         MaximizeBoxRect.Left + MaximizeBoxRect.Width / 2 - 2,
                         MaximizeBoxRect.Top + MaximizeBoxRect.Height / 2 - 4,
-                        MaximizeBoxRect.Left + MaximizeBoxRect.Width / 2 +5,
+                        MaximizeBoxRect.Left + MaximizeBoxRect.Width / 2 + 5,
                         MaximizeBoxRect.Top + MaximizeBoxRect.Height / 2 - 4);
 
                     e.Graphics.DrawLine(Color.White,
diff --git a/SunnyUI/Forms/UIForm.designer.cs b/SunnyUI/Forms/UIForm.designer.cs
index 0740a826..e9212cb5 100644
--- a/SunnyUI/Forms/UIForm.designer.cs
+++ b/SunnyUI/Forms/UIForm.designer.cs
@@ -35,8 +35,14 @@
             // UIForm
             // 
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
+            this.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(235)))), ((int)(((byte)(243)))), ((int)(((byte)(255)))));
             this.ClientSize = new System.Drawing.Size(800, 480);
+            this.DoubleBuffered = true;
+            this.Font = new System.Drawing.Font("微软雅黑", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
+            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
             this.Name = "UIForm";
+            this.Padding = new System.Windows.Forms.Padding(0, 35, 0, 0);
+            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
             this.Text = "UIForm";
             this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.UIForm_FormClosing);
             this.ResumeLayout(false);