diff --git a/Consts/MainConst.cs b/Consts/MainConst.cs
index 83549a5..34c67d6 100644
--- a/Consts/MainConst.cs
+++ b/Consts/MainConst.cs
@@ -12,7 +12,7 @@ namespace Sheas_Cealer.Consts
         [GeneratedRegex(@"^\r$")]
         internal static partial Regex HostRegex();
 
-        [GeneratedRegex(@"^((((ht|f)tps?):\/\/)?[a-zA-Z0-9](-*[a-zA-Z0-9])*(\.[a-zA-Z0-9](-*[a-zA-Z0-9])*)*(:\d{1,5})?(\/[a-zA-Z0-9.-_\~\!\$\&\'\(\)\*\+\,\;\=\:\@\%]*)*)?$")]
+        [GeneratedRegex(@"^((((ht|f)tps?):\/\/)?[a-zA-Z0-9](-*[a-zA-Z0-9])*(\.[a-zA-Z0-9](-*[a-zA-Z0-9])*)*(:\d{1,5})?(\/[a-zA-Z0-9.\-_\~\!\$\&\'\(\)\*\+\,\;\=\:\@\%]*)*)?$")]
         internal static partial Regex UrlRegex();
 
         [GeneratedRegex(@"^(--[a-z](-?[a-z])*( --[a-z](-?[a-z])*)*)?$")]
diff --git a/Convs/MainContentBoxTextConv.cs b/Convs/MainContentBoxTextConv.cs
index d21d6ca..c8839eb 100644
--- a/Convs/MainContentBoxTextConv.cs
+++ b/Convs/MainContentBoxTextConv.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Windows.Data;
 using Sheas_Cealer.Consts;
 
@@ -18,9 +19,9 @@ namespace Sheas_Cealer.Convs
 
             if (mode == MainConst.Mode.browserPathMode)
             {
-                if((bool)!isFocused! && string.IsNullOrEmpty(browserPath))
+                if ((bool)!isFocused! && string.IsNullOrEmpty(browserPath))
                     return MainConst.BrowserPathPlaceHolder;
-                else if((bool)isFocused! && browserPath == MainConst.BrowserPathPlaceHolder)
+                else if ((bool)isFocused! && browserPath == MainConst.BrowserPathPlaceHolder)
                     return string.Empty;
                 else
                     return browserPath!;
@@ -45,7 +46,7 @@ namespace Sheas_Cealer.Convs
             }
             else
             {
-                throw new Exception("Invalid mode");
+                throw new UnreachableException();
             }
         }
 
diff --git a/Convs/MainStartCealButtonIsEnabledConv.cs b/Convs/MainStartCealButtonIsEnabledConv.cs
new file mode 100644
index 0000000..3dda332
--- /dev/null
+++ b/Convs/MainStartCealButtonIsEnabledConv.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Globalization;
+using System.IO;
+using System.Windows.Data;
+using Sheas_Cealer.Consts;
+
+namespace Sheas_Cealer.Convs
+{
+    internal class MainStartCealButtonIsEnabledConv : IMultiValueConverter
+    {
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            string? browserPath = values[0] as string;
+            string? upstreamUrl = values[1] as string;
+            string? extraArgs = values[2] as string;
+
+            if (File.Exists(browserPath) && Path.GetFileName(browserPath).ToLower().EndsWith(".exe") && MainConst.UrlRegex().IsMatch(upstreamUrl!) && MainConst.ArgsRegex().IsMatch(extraArgs!))
+                return true;
+
+            return false;
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
\ No newline at end of file
diff --git a/Wins/AboutWin.xaml.cs b/Wins/AboutWin.xaml.cs
index 3af7ba1..31c9498 100644
--- a/Wins/AboutWin.xaml.cs
+++ b/Wins/AboutWin.xaml.cs
@@ -14,10 +14,10 @@ namespace Sheas_Cealer.Wins
 
         private void AboutButton_Click(object sender, RoutedEventArgs e)
         {
-            if (sender == VersionButton)
+            if (sender as Button == VersionButton)
                 MessageBox.Show("密码: 3wnj");
 
-            ProcessStartInfo processStartInfo = new(sender == EmailButton ? "mailto:" : string.Empty + (sender as Button)!.ToolTip) { UseShellExecute = true };
+            ProcessStartInfo processStartInfo = new(sender as Button == EmailButton ? "mailto:" : string.Empty + (sender as Button)!.ToolTip) { UseShellExecute = true };
             Process.Start(processStartInfo);
         }
 
diff --git a/Wins/MainWin.xaml b/Wins/MainWin.xaml
index a1a3a8e..4b797ae 100644
--- a/Wins/MainWin.xaml
+++ b/Wins/MainWin.xaml
@@ -29,7 +29,7 @@
                 <ColumnDefinition Width="Auto" />
             </Grid.ColumnDefinitions>
 
-            <TextBox utils:FocusExtension.IsFocused="{Binding IsContentBoxFocused}"
+            <TextBox x:Name="ContentText" utils:FocusExtension.IsFocused="{Binding IsContentBoxFocused}"
                      Grid.Column="0" Margin="5" VerticalContentAlignment="Center"
                      TextChanged="ContentBox_TextChanged" PreviewDragOver="MainWin_DragEnter">
                 <TextBox.Text>
@@ -37,13 +37,13 @@
                         <MultiBinding.Converter>
                             <convs:MainContentBoxTextConv />
                         </MultiBinding.Converter>
-                        
+
                         <Binding Path="Mode" />
                         <Binding Path="IsFocused" RelativeSource="{RelativeSource Self}" />
                         <Binding Path="BrowserPath" />
                         <Binding Path="UpstreamUrl" />
                         <Binding Path="ExtraArgs" />
-                        
+
                     </MultiBinding>
                 </TextBox.Text>
                 <TextBox.Foreground>
@@ -51,13 +51,13 @@
                         <MultiBinding.Converter>
                             <convs:MainContentBoxForegroundConv />
                         </MultiBinding.Converter>
-                        
+
                         <Binding Path="Mode" />
                         <Binding Path="IsFocused" RelativeSource="{RelativeSource Self}" />
                         <Binding Path="BrowserPath" />
                         <Binding Path="UpstreamUrl" />
                         <Binding Path="ExtraArgs" />
-                        
+
                     </MultiBinding>
                 </TextBox.Foreground>
             </TextBox>
@@ -65,12 +65,26 @@
                     Click="BrowseButton_Click" />
             <Button Grid.Column="2" Margin="5" Content="{Binding SwitchModeButtonContent, Source={StaticResource MainConst}}"
                     Click="SwitchModeButton_Click" />
-            
+
         </Grid>
 
         <Button IsDefault="True"
                 Grid.Row="1" Margin="5" Content="{Binding StartCealButtonContent, Source={StaticResource MainConst}}"
-                Click="StartCealButton_Click" />
+                Click="StartCealButton_Click">
+
+            <Button.IsEnabled>
+                <MultiBinding>
+                    <MultiBinding.Converter>
+                        <convs:MainStartCealButtonIsEnabledConv />
+                    </MultiBinding.Converter>
+
+                    <Binding Path="BrowserPath" />
+                    <Binding Path="UpstreamUrl" />
+                    <Binding Path="ExtraArgs" />
+
+                </MultiBinding>
+            </Button.IsEnabled>
+        </Button>
 
         <Grid Grid.Row="2">
             <Grid.ColumnDefinitions>
@@ -78,7 +92,7 @@
                 <ColumnDefinition Width="*" />
                 <ColumnDefinition Width="*" />
             </Grid.ColumnDefinitions>
-            
+
             <Button x:Name="EditHostButton"
                     Grid.Column="0" Margin="5" Content="{Binding EditHostButtonContent, Source={StaticResource MainConst}}"
                     Click="EditHostButton_Click" />
@@ -88,7 +102,7 @@
             <Button x:Name="AboutButton"
                     Grid.Column="2" Margin="5" Content="{Binding AboutButtonContent, Source={StaticResource MainConst}}"
                     Click="AboutButton_Click" />
-            
+
         </Grid>
     </Grid>
 </Window>
\ No newline at end of file
diff --git a/Wins/MainWin.xaml.cs b/Wins/MainWin.xaml.cs
index 5408a70..1310937 100644
--- a/Wins/MainWin.xaml.cs
+++ b/Wins/MainWin.xaml.cs
@@ -61,18 +61,14 @@ namespace Sheas_Cealer.Wins
         {
             TextBox? ContentBox = sender as TextBox;
 
-            switch (MainPres!.Mode)
-            {
-                case MainConst.Mode.browserPathMode:
-                    MainPres.BrowserPath = ContentBox!.Text;
-                    return;
-                case MainConst.Mode.upstreamUrlMode:
-                    MainPres.UpstreamUrl = ContentBox!.Text;
-                    return;
-                case MainConst.Mode.extraArgsMode:
-                    MainPres.ExtraArgs = ContentBox!.Text;
-                    return;
-            };
+            if (MainPres!.Mode == MainConst.Mode.browserPathMode)
+                MainPres.BrowserPath = ContentBox!.Text;
+            else if (MainPres!.Mode == MainConst.Mode.upstreamUrlMode)
+                MainPres.UpstreamUrl = ContentBox!.Text;
+            else if (MainPres!.Mode == MainConst.Mode.extraArgsMode)
+                MainPres.ExtraArgs = ContentBox!.Text;
+            else
+                throw new UnreachableException();
         }
         private void BrowseButton_Click(object sender, RoutedEventArgs e)
         {
@@ -123,7 +119,6 @@ namespace Sheas_Cealer.Wins
         private async void UpdateHostButton_Click(object sender, RoutedEventArgs e)
         {
             string hostUrl = MainPres!.UpstreamUrl;
-
             string UpdateHostString = await Http.GetAsync<string>(hostUrl, MainClient);
             StreamReader hostLocalStreamReader = new(Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase!, @"Cealing-Host.json"));
             string hostLocalString = hostLocalStreamReader.ReadToEnd();