diff --git a/STranslate/Model/ConfigModel.cs b/STranslate/Model/ConfigModel.cs
index 4e109e0..3ca9d35 100644
--- a/STranslate/Model/ConfigModel.cs
+++ b/STranslate/Model/ConfigModel.cs
@@ -17,6 +17,7 @@ namespace STranslate.Model
         {
             return new ConfigModel
             {
+                AutoScale = 0.8,
                 WordPickupInterval = 200,
                 IsBright = true,
                 SourceLanguage = LanguageEnum.AUTO.GetDescription(),
@@ -44,7 +45,12 @@ namespace STranslate.Model
         }
 
         /// <summary>
-        /// 是否亮色模式
+        /// 自动识别语种标度
+        /// </summary>
+        [JsonProperty("autoScale")]
+        public double AutoScale { get; set; }
+        /// <summary>
+        /// 取词间隔
         /// </summary>
         [JsonProperty("wordPickupInterval")]
         public double WordPickupInterval { get; set; }
diff --git a/STranslate/View/SettingsWindow.xaml b/STranslate/View/SettingsWindow.xaml
index f3fdcdf..c49c1f7 100644
--- a/STranslate/View/SettingsWindow.xaml
+++ b/STranslate/View/SettingsWindow.xaml
@@ -65,6 +65,21 @@
                             </CheckBox>
                         </WrapPanel>
                     </GroupBox>
+                    <GroupBox Header="语种识别(zh-en)"
+                              ToolTip="根据英文字符占所有字符比例判断中英文">
+                        <WrapPanel Margin="0,5,0,5">
+                            <Slider Value="{Binding DataContext.AutoScale, ElementName=window}"
+                                    Minimum="0.01"
+                                    Maximum="0.99"
+                                    MinWidth="200"
+                                    TickFrequency="0.01"
+                                    TickPlacement="None"
+                                    IsSnapToTickEnabled="True">
+                            </Slider>
+                            <TextBlock Text="{Binding AutoScale, StringFormat={}{0}}" Margin="10,0,0,0" />
+                        </WrapPanel>
+                    </GroupBox>
+                    
                     <GroupBox Header="取词间隔"
                               ToolTip="划词翻译实现原理是：用户用鼠标划词后模拟Ctrl+C，间隔一定时间后，程序再从剪切板取词，如果电脑反应慢，可能会出现取不到词的问题，将间隔调大可以适配一些老旧的机器">
                         <WrapPanel Margin="0,5,0,5">
diff --git a/STranslate/View/SettingsWindow.xaml.cs b/STranslate/View/SettingsWindow.xaml.cs
index 404f505..0351a9d 100644
--- a/STranslate/View/SettingsWindow.xaml.cs
+++ b/STranslate/View/SettingsWindow.xaml.cs
@@ -23,6 +23,10 @@ namespace STranslate.View
         {
             InitializeComponent();
 
+#if DEBUG
+            this.window.Topmost = true;
+#endif
+
             DataContext = ViewModel.SettingsVM.Instance;
         }
     }
diff --git a/STranslate/ViewModel/MainVM.cs b/STranslate/ViewModel/MainVM.cs
index 52ee0ec..735538b 100644
--- a/STranslate/ViewModel/MainVM.cs
+++ b/STranslate/ViewModel/MainVM.cs
@@ -231,6 +231,10 @@ namespace STranslate.ViewModel
             {
                 _globalConfig = ConfigHelper.Instance.ReadConfig<ConfigModel>();
 
+                //读取自动识别语种比例
+                var scale = _globalConfig.AutoScale;
+                SettingsVM.Instance.AutoScale = (scale <= 0 || scale >= 1) ? 0.8 : scale;
+
                 //读取间隔
                 var tmp = _globalConfig.WordPickupInterval;
                 SettingsVM.Instance.WordPickupInterval = (tmp == 0 || tmp > 1000 || tmp < 100) ? 200 : tmp;
@@ -271,6 +275,7 @@ namespace STranslate.ViewModel
             {
                 ConfigHelper.Instance.WriteConfig(new ConfigModel
                 {
+                    AutoScale = SettingsVM.Instance.AutoScale,
                     WordPickupInterval = SettingsVM.Instance.WordPickupInterval,
                     IsBright = Application.Current.Resources.MergedDictionaries[0].Source.ToString() == ThemeDefault ? true : false,
                     SourceLanguage = InputComboSelected,
@@ -306,9 +311,8 @@ namespace STranslate.ViewModel
 
             var ratio = (double)engStr.Length / text.Length;
             
-            //3. 判断英文字符个数占第一步所有字符个数比例，若超过一半则判定原字符串为英文字符串，否则为中文字符串
-            //TODO: 配置项
-            if (ratio > 0.8)
+            //3. 判断英文字符个数占第一步所有字符个数比例，若超过一定比例则判定原字符串为英文字符串，否则为中文字符串
+            if (ratio > SettingsVM.Instance.AutoScale)
             {
                 return new Tuple<string, string>(LanguageEnum.EN.GetDescription(), LanguageEnum.ZH.GetDescription());
             }
diff --git a/STranslate/ViewModel/SettingsVM.cs b/STranslate/ViewModel/SettingsVM.cs
index c23dcf7..4d7a44b 100644
--- a/STranslate/ViewModel/SettingsVM.cs
+++ b/STranslate/ViewModel/SettingsVM.cs
@@ -124,6 +124,12 @@ namespace STranslate.ViewModel
         private string _version;
         public string Version { get => _version; set => UpdateProperty(ref _version, value); }
 
+        /// <summary>
+        /// 语种识别比例
+        /// </summary>
+        private double _autoScale;
+        public double AutoScale { get => _autoScale; set => UpdateProperty(ref _autoScale, value); }
+
         /// <summary>
         /// 取词间隔
         /// </summary>