diff --git a/SunnyUI/Controls/UITabControl.cs b/SunnyUI/Controls/UITabControl.cs
index ef8575cc..12fb5d94 100644
--- a/SunnyUI/Controls/UITabControl.cs
+++ b/SunnyUI/Controls/UITabControl.cs
@@ -36,6 +36,7 @@
  * 2024-11-29: V3.8.0 修复了SelectedIndex=-1时的报错
  * 2024-12-12: V3.8.0 修复标签文字越界显示 #IB8571
  * 2024-12-12: V3.8.0 增加未选页签颜色 #IB7U69
+ * 2025-02-07: V3.8.1 修复切换主题色时，TabPage未设置背景色，#IBKDR7
 ******************************************************************************/
 
 using System;
@@ -565,6 +566,11 @@ namespace Sunny.UI
             tabSelectedForeColor = uiColor.TabControlTabSelectedColor;
             tabSelectedHighColor = uiColor.TabControlTabSelectedColor;
             _fillColor = uiColor.TabControlBackColor;
+
+            foreach (TabPage page in TabPages)
+            {
+                page.BackColor = _fillColor;
+            }
         }
 
         private UIMenuStyle _menuStyle = UIMenuStyle.Black;
diff --git a/SunnyUI/Style/UIStyleColor.cs b/SunnyUI/Style/UIStyleColor.cs
index 86b7534d..50ae6006 100644
--- a/SunnyUI/Style/UIStyleColor.cs
+++ b/SunnyUI/Style/UIStyleColor.cs
@@ -548,7 +548,7 @@ namespace Sunny.UI
 
             PanelForeColor = ForeColor;
             PanelRectColor = RectColor;
-            PanelFillColor = PlainColor;
+            TabControlBackColor = PanelFillColor = PlainColor;
             PanelFillColor2 = PlainColor;
             PanelTitleColor = FormTitleColor;
             PanelTitleForeColor = ForeColor;
@@ -668,7 +668,7 @@ namespace Sunny.UI
 
             PanelForeColor = ForeColor;
             PanelRectColor = RectColor;
-            PanelFillColor = PlainColor;
+            TabControlBackColor = PanelFillColor = PlainColor;
             PanelFillColor2 = PlainColor;
             PanelTitleColor = FormTitleColor;
             PanelTitleForeColor = ForeColor;