diff --git a/Tiefsee/Lib/WindowAPI.cs b/Tiefsee/Lib/WindowAPI.cs
index c18b101..6caa77b 100644
--- a/Tiefsee/Lib/WindowAPI.cs
+++ b/Tiefsee/Lib/WindowAPI.cs
@@ -286,6 +286,48 @@ public static void GlobalActivate(IntPtr interopHelper) {
         private static extern bool AttachThreadInput(uint idAttach, uint idAttachTo, bool fAttach);
 
         #endregion
+
+        #region 任務欄
+
+        [StructLayout(LayoutKind.Sequential)]
+        public struct APPBARDATA
+        {
+            public int cbSize;
+            public IntPtr hWnd;
+            public uint uCallbackMessage;
+            public uint uEdge;
+            public RECT rc;
+            public int lParam;
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        public struct RECT
+        {
+            public int left;
+            public int top;
+            public int right;
+            public int bottom;
+        }
+
+        [DllImport("shell32.dll", SetLastError = true)]
+        public static extern uint SHAppBarMessage(uint dwMessage, ref APPBARDATA pData);
+
+        // ABM_GETSTATE 用來檢查任務欄狀態的訊息
+        public const uint ABM_GETSTATE = 0x00000004;
+
+
+        public const uint ABM_GETTASKBARPOS = 0x00000005;
+
+        // 設定任務欄的狀態，當值為 ABS_AUTOHIDE 時，表示啟用了自動隱藏
+        public const int ABS_AUTOHIDE = 0x1;
+
+        // APPBARDATA edge 可能的值
+        public const uint ABE_LEFT = 0;
+        public const uint ABE_TOP = 1;
+        public const uint ABE_RIGHT = 2;
+        public const uint ABE_BOTTOM = 3;
+
+        #endregion
     }
 
 }
diff --git a/Tiefsee/VW/WV_Window.cs b/Tiefsee/VW/WV_Window.cs
index 2c723f2..ad6ccff 100644
--- a/Tiefsee/VW/WV_Window.cs
+++ b/Tiefsee/VW/WV_Window.cs
@@ -350,6 +350,7 @@ public string WindowState {
         set {
             if (value == "Maximized") {
                 // WebWindow.ShowWindow(M.Handle, WebWindow.SW_MAXIMIZE);
+                M.ResetMaximumBound();
                 M.WindowState = FormWindowState.Maximized;
             }
             if (value == "Minimized") {
diff --git a/Tiefsee/WebWindow.cs b/Tiefsee/WebWindow.cs
index a9a20dd..891a6e6 100644
--- a/Tiefsee/WebWindow.cs
+++ b/Tiefsee/WebWindow.cs
@@ -50,6 +50,7 @@ public class WebWindow : FormNone {
     ///
     /// </summary>
     public WebWindow() {
+        ResetMaximumBound();
         WebWindowList.Add(this);
 
         this.FormClosed += (sender, e) => {
@@ -685,6 +686,45 @@ public void WindowRoundedCorners(bool enable) {
         WindowAPI.WindowRoundedCorners(this.Handle, enable);
     }
 
+    public void ResetMaximumBound() {
+        APPBARDATA abd = new APPBARDATA();
+        abd.cbSize = Marshal.SizeOf(abd);
+        // 獲取任務欄狀態
+        uint state = SHAppBarMessage(ABM_GETSTATE, ref abd);
+
+        // 檢查是否啟用了自動隱藏
+        if ((state & ABS_AUTOHIDE) == ABS_AUTOHIDE) {
+            state = SHAppBarMessage(ABM_GETTASKBARPOS, ref abd);
+            var bounds = Screen.FromHandle(Handle).WorkingArea;
+            bounds.X = 0;
+            bounds.Y = 0;
+            if (state == 1) {
+                switch (abd.uEdge) {
+                    case ABE_TOP:
+                        bounds.Y += 1;
+                        bounds.Height -= 1;
+                        break;
+                    case ABE_BOTTOM:
+                        bounds.Height -= 1;
+                        break;
+                    case ABE_LEFT:
+                        bounds.X += 1;
+                        bounds.Width -= 1;
+                        break;
+                    case ABE_RIGHT:
+                        bounds.Width -= 1;
+                        break;
+                }
+            }
+            MaximizedBounds = bounds;
+        }
+        else {
+            var bounds = Screen.FromHandle(Handle).WorkingArea;
+            bounds.X = 0;
+            bounds.Y = 0;
+            MaximizedBounds = bounds;
+        }
+    }
 }
 
 /// <summary>