diff --git a/Ink Canvas/MainWindow.xaml.cs b/Ink Canvas/MainWindow.xaml.cs
index 5140e1bd..03341f98 100644
--- a/Ink Canvas/MainWindow.xaml.cs	
+++ b/Ink Canvas/MainWindow.xaml.cs	
@@ -46,7 +46,6 @@ public MainWindow()
         {
             InitializeComponent();
 
-
             BorderSettings.Visibility = Visibility.Collapsed;
             StackPanelToolButtons.Visibility = Visibility.Collapsed;
             BorderDrawShape.Visibility = Visibility.Collapsed;
@@ -148,22 +147,21 @@ private void TimerKillProcess_Elapsed(object sender, ElapsedEventArgs e)
                 }
             }
             catch { }
-        }
+        }        
 
         #endregion Timer
 
         #region Ink Canvas Functions
-
-        Color Ink_DefaultColor = Colors.Red;
-
+        
         DrawingAttributes drawingAttributes;
         private void loadPenCanvas()
         {
+            SetDarkColors();
             try
             {
                 //drawingAttributes = new DrawingAttributes();
                 drawingAttributes = inkCanvas.DefaultDrawingAttributes;
-                drawingAttributes.Color = Ink_DefaultColor;
+                drawingAttributes.Color = ((SolidColorBrush)BtnColorRed.Background).Color;
 
                 drawingAttributes.Height = 2.5;
                 drawingAttributes.Width = 2.5;
@@ -1557,13 +1555,20 @@ private void BtnColorRed_Click(object sender, RoutedEventArgs e)
         {
             inkColor = 1;
             forceEraser = false;
-            if (BtnSwitchTheme.Content.ToString() == "浅色")
+            if (!isLastSwitchColorByFloatBar)
             {
-                SetDarkColors();    //在浅色背景上使用深色墨迹
+                if (BtnSwitchTheme.Content.ToString() == "浅色")
+                {
+                    SetDarkColors();    //在浅色背景上使用深色墨迹
+                }
+                else
+                {
+                    SetLightColors();    //在深色背景上使用浅色墨迹
+                }
             }
             else
             {
-                SetLightColors();    //在深色背景上使用浅色墨迹
+                isLastSwitchColorByFloatBar = false;
             }
             inkCanvas.DefaultDrawingAttributes.Color = ((SolidColorBrush)BtnColorRed.Background).Color;
 
@@ -1574,13 +1579,20 @@ private void BtnColorGreen_Click(object sender, RoutedEventArgs e)
         {
             inkColor = 2;
             forceEraser = false;
-            if (BtnSwitchTheme.Content.ToString() == "浅色")
+            if (!isLastSwitchColorByFloatBar)
             {
-                SetDarkColors();    //在浅色背景上使用深色墨迹
+                if (BtnSwitchTheme.Content.ToString() == "浅色")
+                {
+                    SetDarkColors();    //在浅色背景上使用深色墨迹
+                }
+                else
+                {
+                    SetLightColors();    //在深色背景上使用浅色墨迹
+                }
             }
             else
             {
-                SetLightColors();    //在深色背景上使用浅色墨迹
+                isLastSwitchColorByFloatBar = false;
             }
             inkCanvas.DefaultDrawingAttributes.Color = ((SolidColorBrush)BtnColorGreen.Background).Color;
 
@@ -1591,6 +1603,21 @@ private void BtnColorBlue_Click(object sender, RoutedEventArgs e)
         {
             inkColor = 3;
             forceEraser = false;
+            if (!isLastSwitchColorByFloatBar)
+            {
+                if (BtnSwitchTheme.Content.ToString() == "浅色")
+                {
+                    SetDarkColors();    //在浅色背景上使用深色墨迹
+                }
+                else
+                {
+                    SetLightColors();    //在深色背景上使用浅色墨迹
+                }
+            }
+            else
+            {
+                isLastSwitchColorByFloatBar = false;
+            }
             inkCanvas.DefaultDrawingAttributes.Color = ((SolidColorBrush)BtnColorBlue.Background).Color;
 
             ColorSwitchCheck();
@@ -1600,13 +1627,20 @@ private void BtnColorYellow_Click(object sender, RoutedEventArgs e)
         {
             inkColor = 4;
             forceEraser = false;
-            if (BtnSwitchTheme.Content.ToString() == "浅色")
+            if (!isLastSwitchColorByFloatBar)
             {
-                SetDarkColors();    //在浅色背景上使用深色墨迹
+                if (BtnSwitchTheme.Content.ToString() == "浅色")
+                {
+                    SetDarkColors();    //在浅色背景上使用深色墨迹
+                }
+                else
+                {
+                    SetLightColors();    //在深色背景上使用浅色墨迹
+                }
             }
             else
             {
-                SetLightColors();    //在深色背景上使用浅色墨迹
+                isLastSwitchColorByFloatBar = false;
             }
             inkCanvas.DefaultDrawingAttributes.Color = ((SolidColorBrush)BtnColorYellow.Background).Color;
 
@@ -5864,6 +5898,7 @@ private void SetLightColors()
             {
                 BtnColorRed.Background = new SolidColorBrush(StringToColor("#FFFF3333"));
                 BtnColorGreen.Background = new SolidColorBrush(StringToColor("#FF1ED760"));
+                BtnColorBlue.Background = new SolidColorBrush(StringToColor("#FF239AD6"));
                 BtnColorYellow.Background = new SolidColorBrush(StringToColor("#FFFFC000"));
             }
         }
@@ -5882,6 +5917,7 @@ private void SetDarkColors()
             {
                 BtnColorRed.Background = new SolidColorBrush(Colors.Red);
                 BtnColorGreen.Background = new SolidColorBrush(StringToColor("#FF169141"));
+                BtnColorBlue.Background = new SolidColorBrush(StringToColor("#FF239AD6"));
                 BtnColorYellow.Background = new SolidColorBrush(StringToColor("#FFF38B00"));
             }
         }
@@ -6853,6 +6889,8 @@ private void HideSubPanels()
             BorderTools.Visibility = Visibility.Collapsed;
         }
 
+        bool isLastSwitchColorByFloatBar = false;
+
         private void BorderPenColorBlack_MouseUp(object sender, MouseButtonEventArgs e)
         {
             BtnColorBlack_Click(BtnColorBlack, null);
@@ -6861,24 +6899,28 @@ private void BorderPenColorBlack_MouseUp(object sender, MouseButtonEventArgs e)
 
         private void BorderPenColorRed_MouseUp(object sender, MouseButtonEventArgs e)
         {
+            isLastSwitchColorByFloatBar = true;
             BtnColorRed_Click(BtnColorRed, null);
             HideSubPanels();
         }
 
         private void BorderPenColorGreen_MouseUp(object sender, MouseButtonEventArgs e)
         {
+            isLastSwitchColorByFloatBar = true;
             BtnColorGreen_Click(BtnColorGreen, null);
             HideSubPanels();
         }
 
         private void BorderPenColorBlue_MouseUp(object sender, MouseButtonEventArgs e)
         {
+            isLastSwitchColorByFloatBar = true;
             BtnColorBlue_Click(BtnColorBlue, null);
             HideSubPanels();
         }
 
         private void BorderPenColorYellow_MouseUp(object sender, MouseButtonEventArgs e)
         {
+            isLastSwitchColorByFloatBar = true;
             BtnColorYellow_Click(BtnColorYellow, null);
             HideSubPanels();
         }