diff --git a/Progrart/Controls/TabSystem/TabButton.axaml b/Progrart/Controls/TabSystem/TabButton.axaml
index a41e012..866897d 100644
--- a/Progrart/Controls/TabSystem/TabButton.axaml
+++ b/Progrart/Controls/TabSystem/TabButton.axaml
@@ -13,7 +13,12 @@
 			<Border Grid.ColumnSpan="2" Background="#4888" CornerRadius="12" Name="HintBackground" IsVisible="False">
 				<Border BorderThickness="1,1,1,0" CornerRadius="12" BorderBrush="#8888"></Border>
 			</Border>
-			<Button Name="MainButton" MinWidth="50"  Padding="6,2" VerticalAlignment="Stretch">Blank Page</Button>
+			<Button Name="MainButton" MinWidth="50"  Padding="6,2" VerticalAlignment="Stretch">
+				<StackPanel Orientation="Horizontal">
+					<TextBlock Name="ModificationIndicator" IsVisible="False">*</TextBlock>
+					<TextBlock Name="TitleBlock">Blank Page</TextBlock>
+				</StackPanel>
+			</Button>
 			<Button Name="CloseButton" VerticalAlignment="Stretch" Grid.Column="1" Padding="6,2">
 				<Viewbox Height="10" Width="10">
 					<PathIcon Data="F1 M 4.08 6 L 4.16 5.96 C 4.24 5.853333 4.34 5.799999 4.46 5.799999 C 4.58 5.799999 4.693333 5.826666 4.8 5.879999 L 10 11.08 L 15.16 5.96 C 15.239999 5.853333 15.339999 5.799999 15.46 5.799999 C 15.579999 5.799999 15.693332 5.826666 15.799999 5.879999 L 15.839999 5.96 C 15.946666 6.040001 16 6.14 16 6.259999 C 16 6.38 15.973333 6.493334 15.92 6.599999 L 10.719999 11.799999 L 15.839999 16.959999 C 15.946666 17.040001 16 17.139999 16 17.259998 C 16 17.379999 15.973333 17.493332 15.92 17.599998 L 15.839999 17.639999 C 15.759998 17.746666 15.659999 17.799999 15.54 17.799999 C 15.419999 17.799999 15.306665 17.773333 15.2 17.719999 L 10 12.52 L 4.84 17.639999 C 4.759999 17.746666 4.66 17.799999 4.54 17.799999 C 4.42 17.799999 4.306666 17.773333 4.2 17.719999 L 4.16 17.639999 C 4.053333 17.559999 4 17.459999 4 17.34 C 4 17.219999 4.026667 17.106667 4.08 17 L 9.28 11.799999 L 4.16 6.639999 C 4.053333 6.56 4 6.46 4 6.339999 C 4 6.22 4.026667 6.106668 4.08 6 L 4.16 5.96 Z " VerticalAlignment="Center" HorizontalAlignment="Center" />
diff --git a/Progrart/Controls/TabSystem/TabButton.axaml.cs b/Progrart/Controls/TabSystem/TabButton.axaml.cs
index 45aca55..a18ecf0 100644
--- a/Progrart/Controls/TabSystem/TabButton.axaml.cs
+++ b/Progrart/Controls/TabSystem/TabButton.axaml.cs
@@ -6,7 +6,7 @@ namespace Progrart.Controls.TabSystem;
 
 public partial class TabButton : UserControl
 {
-	public string? Title { get => MainButton.Content as string; set => MainButton.Content = value; }
+	public string? Title { get => TitleBlock.Text; set => TitleBlock.Text = value; }
 	public string? TooltipText { get => ToolTip.GetTip(MainButton) as string; set => ToolTip.SetTip(MainButton, value); }
 	public ITabPage? page = null;
 	public TabHost? Host = null;
@@ -48,4 +48,19 @@ public partial class TabButton : UserControl
 			pageControl.IsVisible = v;
 		this.HintBackground.IsVisible = v;
 	}
+	public void ModificationCheck()
+	{
+		if (page is ITabPage tabPage)
+		{
+			ModificationIndicator.IsVisible= tabPage.IsModified();
+		}
+	}
+	public bool IsModified()
+	{
+		if (page is ITabPage tabPage)
+		{
+			return tabPage.IsModified();
+		}
+		return false;
+	}
 }
\ No newline at end of file
diff --git a/Progrart/Controls/TabSystem/TabHost.axaml.cs b/Progrart/Controls/TabSystem/TabHost.axaml.cs
index 6b21cf7..382665a 100644
--- a/Progrart/Controls/TabSystem/TabHost.axaml.cs
+++ b/Progrart/Controls/TabSystem/TabHost.axaml.cs
@@ -55,6 +55,26 @@ public partial class TabHost : UserControl
 			}
 		}
 	}
+	public async Task ForeachButton(Func<TabButton, Task<bool>> handler)
+	{
+		foreach (var item in TabContainer.Children)
+		{
+			if (item is TabButton btn)
+			{
+				if (await handler(btn)) break;
+			}
+		}
+	}
+	public void ForeachButton(Func<TabButton, bool> handler)
+	{
+		foreach (var item in TabContainer.Children)
+		{
+			if (item is TabButton btn)
+			{
+				if (handler(btn)) break;
+			}
+		}
+	}
 	public void SelectButton(TabButton button)
 	{
 		foreach (var item in TabContainer.Children)
diff --git a/Progrart/Dialogs/CloseConfirmationDialog.axaml b/Progrart/Dialogs/CloseConfirmationDialog.axaml
new file mode 100644
index 0000000..1420ebf
--- /dev/null
+++ b/Progrart/Dialogs/CloseConfirmationDialog.axaml
@@ -0,0 +1,21 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Progrart.Dialogs.CloseConfirmationDialog">
+	<StackPanel>
+		<TextBlock FontSize="18" Name="TitleBlock" TextWrapping="Wrap"/>
+		<TextBlock Name="MessageBlock" TextWrapping="Wrap"/>
+		<Grid>
+			<Grid.ColumnDefinitions>
+				<ColumnDefinition/>
+				<ColumnDefinition/>
+				<ColumnDefinition/>
+			</Grid.ColumnDefinitions>
+			<Button HorizontalAlignment="Stretch" HorizontalContentAlignment="Center" Classes="accent" Name="OKBtn" Content="Save All"/>
+			<Button HorizontalAlignment="Stretch" HorizontalContentAlignment="Center" Classes="accent" Grid.Column="1" Name="DiscardBtn" Content="Discard And Close"/>
+			<Button HorizontalAlignment="Stretch" HorizontalContentAlignment="Center" Name="CancelBtn" Grid.Column="2" Content="Cancel"/>
+		</Grid>
+	</StackPanel>
+</UserControl>
diff --git a/Progrart/Dialogs/CloseConfirmationDialog.axaml.cs b/Progrart/Dialogs/CloseConfirmationDialog.axaml.cs
new file mode 100644
index 0000000..4e52ad4
--- /dev/null
+++ b/Progrart/Dialogs/CloseConfirmationDialog.axaml.cs
@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Progrart.Dialogs;
+
+public partial class CloseConfirmationDialog : UserControl
+{
+    public CloseConfirmationDialog()
+    {
+        InitializeComponent();
+    }
+}
\ No newline at end of file
diff --git a/Progrart/Pages/ProgrartEditorPage.axaml.cs b/Progrart/Pages/ProgrartEditorPage.axaml.cs
index fed355e..1cb5f31 100644
--- a/Progrart/Pages/ProgrartEditorPage.axaml.cs
+++ b/Progrart/Pages/ProgrartEditorPage.axaml.cs
@@ -90,7 +90,7 @@ public partial class ProgrartEditorPage : UserControl, ITabPage, IEditorPage
 
 	public bool IsModified()
 	{
-		return lastSave == CodeEditor.Text;
+		return lastSave != CodeEditor.Text;
 	}
 
 	public bool IsSameFile(IStorageFile file)
diff --git a/Progrart/Views/MainView.axaml.cs b/Progrart/Views/MainView.axaml.cs
index 0cfb2a7..e8c2f07 100644
--- a/Progrart/Views/MainView.axaml.cs
+++ b/Progrart/Views/MainView.axaml.cs
@@ -2,6 +2,7 @@ using Acornima.Ast;
 using Avalonia.Controls;
 using Avalonia.Platform.Storage;
 using Avalonia.Threading;
+using DialogHostAvalonia;
 using Microsoft.Extensions.Configuration;
 using Newtonsoft.Json;
 using Progrart.Commands;
@@ -11,6 +12,7 @@ using Progrart.Core.JSExecution;
 using Progrart.Core.ProjectSystem;
 using Progrart.Core.Settings;
 using Progrart.Core.Storage;
+using Progrart.Dialogs;
 using Progrart.Pages;
 using System;
 using System.Collections.Generic;
@@ -147,6 +149,21 @@ public partial class MainView : UserControl
 			}
 			ConfigBox.SelectedIndex = 0;
 		};
+		Task.Run(async () =>
+		{
+			while (true)
+			{
+				await Task.Delay(500);
+				await Dispatcher.UIThread.InvokeAsync(async () =>
+				{
+					await MainTabHost.ForeachButton(async (btn) =>
+					{
+						btn.ModificationCheck();
+						return false;
+					});
+				});
+			}
+		});
 	}
 
 	private void Execute()
@@ -279,8 +296,31 @@ public partial class MainView : UserControl
 	{
 		MainTabHost.AddPage(new SettingsPage());
 	}
-
+	internal bool CloseCheck()
+	{
+		bool v = false;
+		MainTabHost.ForeachButton((btn) =>
+		{
+			if (btn.IsModified())
+			{
+				v = true;
+				return true;
+			}
+			return false;
+		});
+		return v;
+	}
 	private void ExitItem_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
 	{
+		if (CloseCheck())
+		{
+			CloseConfirmationDialog dialog = new CloseConfirmationDialog();
+
+			DialogHost.Show(dialog);
+		}
+		else
+		{
+			Environment.Exit(0);
+		}
 	}
 }
\ No newline at end of file