diff --git a/STranslate/MainWindow.xaml b/STranslate/MainWindow.xaml
index ec1e986..5bbed25 100644
--- a/STranslate/MainWindow.xaml
+++ b/STranslate/MainWindow.xaml
@@ -62,7 +62,7 @@
                         HorizontalAlignment="Right"
                         VerticalAlignment="Center"
                         Margin="0,0,100,0"
-                        Click="Button_Click"/>
+                        Command="{Binding ThemeConvertCmd}"/>
                 <ComboBox Style="{DynamicResource cmbstyle}"
                           Margin="0,5,10,0"
                           ItemsSource="{Binding TranslationInterface}"
diff --git a/STranslate/MainWindow.xaml.cs b/STranslate/MainWindow.xaml.cs
index 224affd..335b73b 100644
--- a/STranslate/MainWindow.xaml.cs
+++ b/STranslate/MainWindow.xaml.cs
@@ -282,17 +282,5 @@ namespace STranslate
         private static readonly BitmapImage _Topmost = new BitmapImage(new Uri("pack://application:,,,/STranslate;component/Images/Button_Default/topmost.png"));
         private static readonly BitmapImage _UnTopmost = new BitmapImage(new Uri("pack://application:,,,/STranslate;component/Images/Button_Default/untopmost.png"));
         private System.Windows.Forms.NotifyIcon notifyIcon = new System.Windows.Forms.NotifyIcon();
-
-        private void Button_Click(object sender, RoutedEventArgs e)
-        {
-            if (Application.Current.Resources.MergedDictionaries[0].Source.ToString() == "pack://application:,,,/STranslate;component/Style/Dark.xaml")
-            {
-                Application.Current.Resources.MergedDictionaries[0].Source = new Uri("pack://application:,,,/STranslate;component/Style/Default.xaml");
-            }
-            else
-            {
-                Application.Current.Resources.MergedDictionaries[0].Source = new Uri("pack://application:,,,/STranslate;component/Style/Dark.xaml");
-            }
-        }
     }
 }
\ No newline at end of file
diff --git a/STranslate/ViewModel/MainVM.cs b/STranslate/ViewModel/MainVM.cs
index 977a40e..b1668bd 100644
--- a/STranslate/ViewModel/MainVM.cs
+++ b/STranslate/ViewModel/MainVM.cs
@@ -50,7 +50,9 @@ namespace STranslate.ViewModel
             });
             ThemeConvertCmd = new RelayCommand((_) => true, (_) =>
             {
-
+                Application.Current.Resources.MergedDictionaries[0].Source =
+                Application.Current.Resources.MergedDictionaries[0].Source
+                .ToString() == _ThemeDark ? new Uri(_ThemeDefault) : new Uri(_ThemeDark);
             });
 
             //翻译
@@ -261,7 +263,8 @@ namespace STranslate.ViewModel
         private TranslationInterface _SelectedTranslationInterface;
         public TranslationInterface SelectedTranslationInterface { get => _SelectedTranslationInterface; set => UpdateProperty(ref _SelectedTranslationInterface, value); }
         private static Dictionary<string, LanguageEnum> LanguageEnumDict { get => Util.Util.GetEnumList<LanguageEnum>(); }
-
+        private static readonly string _ThemeDark = "pack://application:,,,/STranslate;component/Style/Dark.xaml";
+        private static readonly string _ThemeDefault = "pack://application:,,,/STranslate;component/Style/Default.xaml";
         #endregion Params
     }
 }
\ No newline at end of file