diff --git a/demo/Semi.Avalonia.Demo/App.axaml.cs b/demo/Semi.Avalonia.Demo/App.axaml.cs
index 1dccc74..305563c 100644
--- a/demo/Semi.Avalonia.Demo/App.axaml.cs
+++ b/demo/Semi.Avalonia.Demo/App.axaml.cs
@@ -1,10 +1,7 @@
-using System.Runtime.InteropServices;
 using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Data.Core.Plugins;
 using Avalonia.Markup.Xaml;
-using Avalonia.Media;
-using Avalonia.Platform;
 using Semi.Avalonia.Demo.Views;
 
 namespace Semi.Avalonia.Demo;
@@ -31,30 +28,7 @@ public partial class App : Application
                 break;
         }
 
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
-        {
-            var setting = PlatformSettings?.GetColorValues();
-            if (setting?.ContrastPreference is ColorContrastPreference.High)
-            {
-                if (setting.AccentColor1 == Color.Parse("#8EE3F0"))
-                {
-                    RequestedThemeVariant = SemiTheme.Aquatic;
-                }
-                else if (setting.AccentColor1 == Color.Parse("#903909"))
-                {
-                    RequestedThemeVariant = SemiTheme.Desert;
-                }
-                else if (setting.AccentColor1 == Color.Parse("#A1BFDE"))
-                {
-                    RequestedThemeVariant = SemiTheme.Dusk;
-                }
-                else if (setting.AccentColor1 == Color.Parse("#D6B4FD"))
-                {
-                    RequestedThemeVariant = SemiTheme.NightSky;
-                }
-            }
-        }
-
+        this.RegisterFollowSystemTheme();
         base.OnFrameworkInitializationCompleted();
     }
 }
\ No newline at end of file
diff --git a/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs b/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
index 6407176..307554b 100644
--- a/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
+++ b/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
@@ -33,9 +33,14 @@ public partial class MainViewModel : ObservableObject
         [
             new MenuItemViewModel
             {
-                Header = "High Contrast Theme",
+                Header = "Theme",
                 Items =
                 [
+                    new MenuItemViewModel
+                    {
+                        Header = "Auto",
+                        Command = FollowSystemThemeCommand
+                    },
                     new MenuItemViewModel
                     {
                         Header = "Aquatic",
@@ -62,10 +67,10 @@ public partial class MainViewModel : ObservableObject
                     },
                 ]
             },
-            new MenuItemViewModel()
+            new MenuItemViewModel
             {
                 Header = "Locale",
-                Items=
+                Items =
                 [
                     new MenuItemViewModel
                     {
@@ -114,6 +119,12 @@ public partial class MainViewModel : ObservableObject
         ];
     }
 
+    [RelayCommand]
+    private void FollowSystemTheme()
+    {
+        Application.Current?.RegisterFollowSystemTheme();
+    }
+
     [RelayCommand]
     private void ToggleTheme()
     {
@@ -121,26 +132,24 @@ public partial class MainViewModel : ObservableObject
         if (app is null) return;
         var theme = app.ActualThemeVariant;
         app.RequestedThemeVariant = theme == ThemeVariant.Dark ? ThemeVariant.Light : ThemeVariant.Dark;
+        app.UnregisterFollowSystemTheme();
     }
 
     [RelayCommand]
     private void SelectTheme(object? obj)
     {
         var app = Application.Current;
-        if (app is not null)
-        {
-            app.RequestedThemeVariant = obj as ThemeVariant;
-        }
+        if (app is null) return;
+        app.RequestedThemeVariant = obj as ThemeVariant;
+        app.UnregisterFollowSystemTheme();
     }
-    
+
     [RelayCommand]
     private void SelectLocale(object? obj)
     {
         var app = Application.Current;
-        if (app is not null)
-        {
-            SemiTheme.OverrideLocaleResources(app, obj as System.Globalization.CultureInfo);
-        }
+        if (app is null) return;
+        SemiTheme.OverrideLocaleResources(app, obj as CultureInfo);
     }
 
     [RelayCommand]
diff --git a/src/Semi.Avalonia/Extensions/ApplicationExtension.cs b/src/Semi.Avalonia/Extensions/ApplicationExtension.cs
new file mode 100644
index 0000000..760b1da
--- /dev/null
+++ b/src/Semi.Avalonia/Extensions/ApplicationExtension.cs
@@ -0,0 +1,59 @@
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using Avalonia;
+using Avalonia.Media;
+using Avalonia.Platform;
+using Avalonia.Styling;
+
+namespace Semi.Avalonia;
+
+public static class ApplicationExtension
+{
+    private static Application _app = null!;
+
+    private static readonly Dictionary<Color, ThemeVariant> ColorThemeMap = new()
+    {
+        [Color.Parse("#8EE3F0")] = SemiTheme.Aquatic,
+        [Color.Parse("#903909")] = SemiTheme.Desert,
+        [Color.Parse("#A1BFDE")] = SemiTheme.Dusk,
+        [Color.Parse("#D6B4FD")] = SemiTheme.NightSky
+    };
+
+    public static void RegisterFollowSystemTheme(this Application app)
+    {
+        _app = app;
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) return;
+        if (app.PlatformSettings is null) return;
+        app.PlatformSettings.ColorValuesChanged -= OnColorValuesChanged;
+        app.PlatformSettings.ColorValuesChanged += OnColorValuesChanged;
+        OnColorValuesChanged(null, app.PlatformSettings?.GetColorValues());
+    }
+
+    public static void UnregisterFollowSystemTheme(this Application app)
+    {
+        _app = app;
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) return;
+        if (app.PlatformSettings is null) return;
+        app.PlatformSettings.ColorValuesChanged -= OnColorValuesChanged;
+    }
+
+    private static void OnColorValuesChanged(object? _, PlatformColorValues? args)
+    {
+        ThemeVariant result;
+        if (args?.ContrastPreference is ColorContrastPreference.High)
+        {
+            result = ColorThemeMap.TryGetValue(args.AccentColor1, out var theme) ? theme : ThemeVariant.Default;
+        }
+        else
+        {
+            result = args?.ThemeVariant switch
+            {
+                PlatformThemeVariant.Light => ThemeVariant.Light,
+                PlatformThemeVariant.Dark => ThemeVariant.Dark,
+                _ => ThemeVariant.Default
+            };
+        }
+
+        _app.RequestedThemeVariant = result;
+    }
+}
\ No newline at end of file