diff --git a/STranslate/MainWindow.xaml b/STranslate/MainWindow.xaml
index 0830d48..bae4211 100644
--- a/STranslate/MainWindow.xaml
+++ b/STranslate/MainWindow.xaml
@@ -1,11 +1,12 @@
-<Window
+<Window x:Class="STranslate.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:vm="clr-namespace:STranslate.ViewModel"
         xmlns:tb="http://www.hardcodet.net/taskbar"
-        xmlns:local="clr-namespace:STranslate" x:Class="STranslate.MainWindow"
+        xmlns:local="clr-namespace:STranslate"
+        xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
         mc:Ignorable="d"
         x:Name="Mwin"
         Background="Transparent"
@@ -135,16 +136,26 @@
                 <ComboBox x:Name="InCombo"
                           Style="{DynamicResource cmbstyle}"
                           ItemsSource="{Binding InputCombo}"
-                          SelectionChanged="SelectionChanged"
-                          SelectedItem="{Binding InputComboSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
+                          SelectedItem="{Binding InputComboSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
+                    <i:Interaction.Triggers>
+                        <i:EventTrigger EventName="SelectionChanged">
+                            <i:InvokeCommandAction Command="{Binding SelectLangChangedCmd}"/>
+                        </i:EventTrigger>
+                    </i:Interaction.Triggers>
+                </ComboBox>
                 <Separator Margin="20,0"/>
                 <TextBlock Text="目标语言:  "
                            Style="{DynamicResource MidStyle}"/>
                 <ComboBox x:Name="OutCombo"
                           Style="{DynamicResource cmbstyle}"
                           ItemsSource="{Binding OutputCombo}"
-                          SelectionChanged="SelectionChanged"
-                          SelectedItem="{Binding OutputComboSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
+                          SelectedItem="{Binding OutputComboSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
+                    <i:Interaction.Triggers>
+                        <i:EventTrigger EventName="SelectionChanged">
+                            <i:InvokeCommandAction Command="{Binding SelectLangChangedCmd}"/>
+                        </i:EventTrigger>
+                    </i:Interaction.Triggers>
+                </ComboBox>
             </StackPanel>
 
             <!--output-->
diff --git a/STranslate/MainWindow.xaml.cs b/STranslate/MainWindow.xaml.cs
index d821fb3..335c9ed 100644
--- a/STranslate/MainWindow.xaml.cs
+++ b/STranslate/MainWindow.xaml.cs
@@ -80,14 +80,5 @@ namespace STranslate
                 this.Hide();
             }
         }
-
-        private void SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
-        {
-            if (!string.IsNullOrEmpty(vm?.InputTxt))
-            {
-                vm.IdentifyLanguage = string.Empty;
-                _ = vm?.Translate();
-            }
-        }
     }
 }
\ No newline at end of file
diff --git a/STranslate/STranslate.csproj b/STranslate/STranslate.csproj
index ea67377..27bda36 100644
--- a/STranslate/STranslate.csproj
+++ b/STranslate/STranslate.csproj
@@ -59,6 +59,9 @@
     <Reference Include="Hardcodet.NotifyIcon.Wpf, Version=1.1.0.0, Culture=neutral, PublicKeyToken=682384a853a08aad, processorArchitecture=MSIL">
       <HintPath>..\packages\Hardcodet.NotifyIcon.Wpf.1.1.0\lib\net472\Hardcodet.NotifyIcon.Wpf.dll</HintPath>
     </Reference>
+    <Reference Include="Microsoft.Expression.Interactions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Windows.Interactivity.WPF.2.0.20525\lib\net40\Microsoft.Expression.Interactions.dll</HintPath>
+    </Reference>
     <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
       <HintPath>..\packages\Newtonsoft.Json.13.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
@@ -68,6 +71,9 @@
     <Reference Include="System.Speech" />
     <Reference Include="System.Web" />
     <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Windows.Interactivity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Windows.Interactivity.WPF.2.0.20525\lib\net40\System.Windows.Interactivity.dll</HintPath>
+    </Reference>
     <Reference Include="System.Xml" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Core" />
@@ -200,6 +206,5 @@
       <EmbedInteropTypes>True</EmbedInteropTypes>
     </COMReference>
   </ItemGroup>
-  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>
\ No newline at end of file
diff --git a/STranslate/ViewModel/MainVM.cs b/STranslate/ViewModel/MainVM.cs
index e0ba273..98b3a5c 100644
--- a/STranslate/ViewModel/MainVM.cs
+++ b/STranslate/ViewModel/MainVM.cs
@@ -92,6 +92,16 @@ namespace STranslate.ViewModel
                 }
             });
 
+            //切换语言
+            SelectLangChangedCmd = new RelayCommand((_) => true, (_) =>
+            {
+                if (!string.IsNullOrEmpty(InputTxt))
+                {
+                    IdentifyLanguage = string.Empty;
+                    _ = Translate();
+                }
+            });
+
             #endregion
 
             #region Common
@@ -376,6 +386,7 @@ namespace STranslate.ViewModel
         public ICommand ExitCmd { get; private set; }
         public ICommand TopmostCmd { get; private set; }
         public ICommand EscCmd { get; private set; }
+        public ICommand SelectLangChangedCmd { get; private set; }
 
         /// <summary>
         /// 是否开机自启
diff --git a/STranslate/packages.config b/STranslate/packages.config
index e670037..48285a0 100644
--- a/STranslate/packages.config
+++ b/STranslate/packages.config
@@ -2,4 +2,5 @@
 <packages>
   <package id="Hardcodet.NotifyIcon.Wpf" version="1.1.0" targetFramework="net48" />
   <package id="Newtonsoft.Json" version="13.0.2" targetFramework="net48" />
+  <package id="System.Windows.Interactivity.WPF" version="2.0.20525" targetFramework="net48" />
 </packages>
\ No newline at end of file