diff --git a/AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs b/AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs
index ce70b2d..04872b1 100644
--- a/AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs
@@ -198,6 +198,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         private void DesignerCanvas_Loaded(object sender, RoutedEventArgs e)
         {
             this.Focus();
+            
         }
 
         protected override void OnRender(DrawingContext dc)
diff --git a/AIStudio.Wpf.DiagramDesigner/Controls/ZoomBox.cs b/AIStudio.Wpf.DiagramDesigner/Controls/ZoomBox.cs
index a804d17..f26f80c 100644
--- a/AIStudio.Wpf.DiagramDesigner/Controls/ZoomBox.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Controls/ZoomBox.cs
@@ -42,7 +42,6 @@ namespace AIStudio.Wpf.DiagramDesigner
                 new FrameworkPropertyMetadata(null,
                     new PropertyChangedCallback(OnDesignerCanvasChanged)));
 
-
         public FrameworkElement DesignerCanvas
         {
             get
@@ -63,7 +62,6 @@ namespace AIStudio.Wpf.DiagramDesigner
             target.OnDesignerCanvasChanged(oldDesignerCanvas, newDesignerCanvas);
         }
 
-
         protected virtual void OnDesignerCanvasChanged(FrameworkElement oldDesignerCanvas, FrameworkElement newDesignerCanvas)
         {
             if (oldDesignerCanvas != null)
@@ -139,8 +137,77 @@ namespace AIStudio.Wpf.DiagramDesigner
                 SetValue(MinimumZoomValueProperty, value);
             }
         }
+
+        public static readonly DependencyProperty FitViewModelProperty =
+           DependencyProperty.Register(nameof(FitViewModel), typeof(FitViewModel), typeof(ZoomBox),
+               new FrameworkPropertyMetadata(null,
+                   new PropertyChangedCallback(OnFitViewModelChanged)));
+
+        public FitViewModel FitViewModel
+        {
+            get
+            {
+                return (FitViewModel)GetValue(FitViewModelProperty);
+            }
+            set
+            {
+                SetValue(FitViewModelProperty, value);
+            }
+        }
+
+        private static void OnFitViewModelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            ZoomBox target = (ZoomBox)d;
+            var fitviewmodel = e.NewValue as FitViewModel;
+            if (fitviewmodel != null)
+            {
+                target.OnFitViewModelChanged(fitviewmodel);
+            }           
+        }
+
+        private void OnFitViewModelChanged(FitViewModel fitViewModel)
+        {
+            if (IsLoaded && fitViewModel != null)
+            {
+                if (fitViewModel.FitMode == FitMode.None)
+                {
+                  
+                }
+                else if (fitViewModel.FitMode == FitMode.FitWidth)
+                {
+                    ZoomValue = (this.ScrollViewer.ViewportWidth * fitViewModel.PaddingRate) / fitViewModel.BoundingRect.Width;
+                }
+                else if (fitViewModel.FitMode == FitMode.FitHeight)
+                {
+                    ZoomValue = (this.ScrollViewer.ViewportHeight * fitViewModel.PaddingRate) / fitViewModel.BoundingRect.Height;
+                }
+                else if (fitViewModel.FitMode == FitMode.FitAuto)
+                {
+                    ZoomValue = Math.Min(
+                        (this.ScrollViewer.ViewportWidth * fitViewModel.PaddingRate) / fitViewModel.BoundingRect.Width,
+                        (this.ScrollViewer.ViewportHeight * fitViewModel.PaddingRate) / fitViewModel.BoundingRect.Height
+                        );
+                }      
+
+                double xOffset, yOffset;
+                xOffset = fitViewModel.BoundingRect.Left * ZoomValue - (this.ScrollViewer.ViewportWidth - fitViewModel.BoundingRect.Width * ZoomValue) / 2;
+                yOffset = fitViewModel.BoundingRect.Top * ZoomValue - (this.ScrollViewer.ViewportHeight - fitViewModel.BoundingRect.Height * ZoomValue) / 2;
+                this.ScrollViewer.ScrollToHorizontalOffset(xOffset);
+                this.ScrollViewer.ScrollToVerticalOffset(yOffset);
+            }
+        }
         #endregion
 
+        public ZoomBox()
+        {
+            this.Loaded += ZoomBox_Loaded;           
+        }
+
+        private void ZoomBox_Loaded(object sender, RoutedEventArgs e)
+        {
+            OnFitViewModelChanged(FitViewModel);
+        }
+
         public override void OnApplyTemplate()
         {
             base.OnApplyTemplate();
@@ -163,6 +230,8 @@ namespace AIStudio.Wpf.DiagramDesigner
 
             this.zoomThumb.DragDelta += new DragDeltaEventHandler(this.Thumb_DragDelta);
             this.zoomSlider.ValueChanged += new RoutedPropertyChangedEventHandler<double>(this.ZoomSlider_ValueChanged);
+
+         
         }
 
         private void ZoomSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
@@ -197,7 +266,7 @@ namespace AIStudio.Wpf.DiagramDesigner
                 Canvas.SetTop(this.zoomThumb, yOffset + this.ScrollViewer.VerticalOffset * scale);
             }
             catch { }
-        }       
+        }
 
         /// <summary>
         /// 用于记录鼠标按下的点
@@ -207,7 +276,6 @@ namespace AIStudio.Wpf.DiagramDesigner
         private void DesignerCanvas_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
         {
             _clickPoint = e.GetPosition((FrameworkElement)sender);
-            Debug.WriteLine($"({_clickPoint.X},{_clickPoint.Y})");
             DesignerCanvas.Cursor = Cursors.Hand;
         }
 
@@ -221,7 +289,6 @@ namespace AIStudio.Wpf.DiagramDesigner
             if (e.RightButton == MouseButtonState.Pressed)
             {
                 FrameworkElement cabSender = (FrameworkElement)sender;
-                //_clickPoint=new Point(scroll.ActualWidth/2,scroll.ActualHeight/2); 
                 double x;
                 double y;
                 Point p = e.MouseDevice.GetPosition(cabSender);
@@ -265,8 +332,34 @@ namespace AIStudio.Wpf.DiagramDesigner
                 xOffset = (x - scale * w) / 2;
                 yOffset = (y - scale * h) / 2;
             }
-         
+
         }
     }
+
+    public class FitViewModel
+    {
+        public Rect BoundingRect
+        {
+            get;set;
+        }
+
+        public FitMode FitMode
+        {
+            get;set;
+        }
+
+        public double PaddingRate
+        {
+            get; set;
+        } = 0.9;
+    }
+
+    public enum FitMode
+    {
+        None,
+        FitAuto,
+        FitWidth,
+        FitHeight,
+    }
 }
 
diff --git a/AIStudio.Wpf.DiagramDesigner/Geometrys/RectangleBase.cs b/AIStudio.Wpf.DiagramDesigner/Geometrys/RectangleBase.cs
index 85a187b..d567bf0 100644
--- a/AIStudio.Wpf.DiagramDesigner/Geometrys/RectangleBase.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Geometrys/RectangleBase.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Windows;
 
 namespace AIStudio.Wpf.DiagramDesigner.Geometrys
 {
@@ -1069,6 +1070,16 @@ namespace AIStudio.Wpf.DiagramDesigner.Geometrys
         //    return value;
         //}
 
+        public static implicit operator RectangleBase(Rect rect)
+        {
+            return new RectangleBase(rect.Left, rect.Top, rect.Width, rect.Height);
+        }
+
+        public static implicit operator Rect(RectangleBase rect)
+        {
+            return new Rect(rect.Left, rect.Top, rect.Width, rect.Height);
+        }
+
         #endregion Public Methods
 
     }
diff --git a/AIStudio.Wpf.DiagramDesigner/UserControls/DiagramControl.xaml b/AIStudio.Wpf.DiagramDesigner/UserControls/DiagramControl.xaml
index b492a67..b81c9b7 100644
--- a/AIStudio.Wpf.DiagramDesigner/UserControls/DiagramControl.xaml
+++ b/AIStudio.Wpf.DiagramDesigner/UserControls/DiagramControl.xaml
@@ -856,7 +856,7 @@
                                                     AllowDrop="{Binding AllowDrop}">
                                                     <dd:DesignerCanvas.LayoutTransform>
                                                         <ScaleTransform ScaleX="{Binding ZoomValue}" ScaleY="{Binding ZoomValue}"  />
-                                                    </dd:DesignerCanvas.LayoutTransform>
+                                                    </dd:DesignerCanvas.LayoutTransform>                                                   
                                                 </dd:DesignerCanvas>
                                             </ItemsPanelTemplate>
                                         </ItemsControl.ItemsPanel>
@@ -887,7 +887,7 @@
                                                                 GridMarginSize="{Binding GridMarginSize}"
                                                                 GridColor="{Binding GridColor}"
                                                                 Background="{Binding PageBackground,Converter={StaticResource ColorBrushConverter}}"
-                                                                AllowDrop="{Binding AllowDrop}">        
+                                                                AllowDrop="{Binding AllowDrop}">
                                                                 <dd:DesignerCanvas.LayoutTransform>
                                                                     <ScaleTransform ScaleX="{Binding ZoomValue}" ScaleY="{Binding ZoomValue}"  />
                                                                 </dd:DesignerCanvas.LayoutTransform>
@@ -905,8 +905,8 @@
                                                 MaximumZoomValue="{Binding MaximumZoomValue,Mode=TwoWay}"  
                                                 MinimumZoomValue="{Binding MinimumZoomValue,Mode=TwoWay}"  
                                                 ZoomValue="{Binding ZoomValue,Mode=TwoWay}"
-                                                Margin="5,0,0,5" />  
-
+                                                FitViewModel="{Binding FitViewModel}"
+                                                Margin="5,0,0,5" />
                                         </Grid>
                                     </ControlTemplate>
                                 </Setter.Value>
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
index d788366..086e942 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
@@ -408,7 +408,7 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
-        private double _maximumZoomValue = 3;
+        private double _maximumZoomValue = 100;
         [Browsable(false)]
         public double MaximumZoomValue
         {
@@ -422,7 +422,7 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
-        private double _minimumZoomValue = 0.5;
+        private double _minimumZoomValue = 0.01;
         [Browsable(false)]
         public double MinimumZoomValue
         {
@@ -463,6 +463,19 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
+        private FitViewModel _fitViewModel;
+        public FitViewModel FitViewModel
+        {
+            get
+            {
+                return _fitViewModel;
+            }
+            set
+            {
+                SetProperty(ref _fitViewModel, value);
+            }
+        }
+
         private string _name;
         [Browsable(false)]
         public string Name
@@ -561,6 +574,26 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
+        protected ObservableCollection<CinchMenuItem> menuOptions;
+        public IEnumerable<CinchMenuItem> MenuOptions
+        {
+            get
+            {
+                return menuOptions;
+            }
+        }
+
+        public bool ShowMenuOptions
+        {
+            get
+            {
+                if (MenuOptions == null || MenuOptions.Count() == 0)
+                    return false;
+                else
+                    return true;
+            }
+        }
+
         public DiagramOption DiagramOption
         {
             get; set;
@@ -739,7 +772,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         }
 
         private SimpleCommand _selectAllCommand;
-        public virtual SimpleCommand SelectAllCommand
+        public SimpleCommand SelectAllCommand
         {
             get
             {
@@ -748,7 +781,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         }
 
         private SimpleCommand _selectInverseCommand;
-        public virtual SimpleCommand SelectInverseCommand
+        public SimpleCommand SelectInverseCommand
         {
             get
             {
@@ -882,6 +915,33 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
+        private SimpleCommand _fitAutoCommand;
+        public SimpleCommand FitAutoCommand
+        {
+            get
+            {
+                return this._fitAutoCommand ?? (this._fitAutoCommand = new SimpleCommand(ExecuteEnable, ExecuteFitAutoCommand));
+            }
+        }
+
+        private SimpleCommand _fitWidthCommand;
+        public SimpleCommand FitWidthCommand
+        {
+            get
+            {
+                return this._fitWidthCommand ?? (this._fitWidthCommand = new SimpleCommand(ExecuteEnable, ExecuteFitWidthCommand));
+            }
+        }
+
+        private SimpleCommand _fitHeightCommand;
+        public SimpleCommand FitHeightCommand
+        {
+            get
+            {
+                return this._fitHeightCommand ?? (this._fitHeightCommand = new SimpleCommand(ExecuteEnable, ExecuteFitHeightCommand));
+            }
+        }
+
         private SimpleCommand _groupCommand;
         public SimpleCommand GroupCommand
         {
@@ -991,6 +1051,7 @@ namespace AIStudio.Wpf.DiagramDesigner
             AllowDrop = diagramItem.AllowDrop;
 
             Init();
+            BuildMenuOptions();
         }
 
         public virtual void Init()
@@ -1003,6 +1064,18 @@ namespace AIStudio.Wpf.DiagramDesigner
             return IsReadOnly == false;
         }
 
+        #region 菜单
+        private void BuildMenuOptions()
+        {
+            menuOptions = new ObservableCollection<CinchMenuItem>();
+            CinchMenuItem menuItem = new CinchMenuItem();
+            menuItem.Text = "居中";
+            menuItem.Command = CenterMoveCommand;
+            menuItem.CommandParameter = this;
+            menuOptions.Add(menuItem);
+        }
+        #endregion
+
         #region UnDo ReDo
 
         private void Do(object sender, string propertyName, object newvalue)
@@ -2250,7 +2323,7 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
-        private void ExecuteCenterMoveCommand(object parameter)
+        protected virtual void ExecuteCenterMoveCommand(object parameter)
         {
             IEnumerable<DesignerItemViewModelBase> selectedItems;
             if (parameter is IEnumerable<DesignerItemViewModelBase> para)
@@ -2267,6 +2340,8 @@ namespace AIStudio.Wpf.DiagramDesigner
                 item.Left = (PageSize.Width - item.ItemWidth) / 2;
                 item.Top = (PageSize.Height - item.ItemHeight) / 2;
             }
+
+            FitViewModel = new FitViewModel() { BoundingRect = DiagramViewModelHelper.GetBoundingRectangle(selectedItems) };
         }
 
         public void UpdateZIndex()
@@ -2329,6 +2404,23 @@ namespace AIStudio.Wpf.DiagramDesigner
 
         #endregion
 
+        #region 适应大小
+        private void ExecuteFitAutoCommand(object parameter)
+        {
+            FitViewModel = new FitViewModel() { BoundingRect = DiagramViewModelHelper.GetBoundingRectangle(Items.OfType<DesignerItemViewModelBase>()), FitMode = FitMode.FitAuto };
+        }
+
+        private void ExecuteFitWidthCommand(object parameter)
+        {
+            FitViewModel = new FitViewModel() { BoundingRect = DiagramViewModelHelper.GetBoundingRectangle(Items.OfType<DesignerItemViewModelBase>()), FitMode = FitMode.FitWidth };
+        }
+
+        private void ExecuteFitHeightCommand(object parameter)
+        {
+            FitViewModel = new FitViewModel() { BoundingRect = DiagramViewModelHelper.GetBoundingRectangle(Items.OfType<DesignerItemViewModelBase>()), FitMode = FitMode.FitHeight };
+        }
+        #endregion
+
         #region 分组
         private void ExecuteGroupCommand(object parameter)
         {
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/DefaultDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/DefaultDesignerItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/DefaultDesignerItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/DefaultDesignerItemViewModel.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/GifImageItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/GifImageItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/GifImageItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/GifImageItemViewModel.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/ImageItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/ImageItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/ImageItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/ImageItemViewModel.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/LinkPointDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/LinkPointDesignerItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/LinkPointDesignerItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/LinkPointDesignerItemViewModel.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/LogicalGateItemViewModelBase.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/LogicalGateItemViewModelBase.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/LogicalGateItemViewModelBase.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/LogicalGateItemViewModelBase.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/MediaItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/MediaItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/MediaItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/MediaItemViewModel.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/PointDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/PointDesignerItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/PointDesignerItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/PointDesignerItemViewModel.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/ShapeDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/ShapeDesignerItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/ShapeDesignerItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/ShapeDesignerItemViewModel.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/TextDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/TextDesignerItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/TextDesignerItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/TextDesignerItemViewModel.cs
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/VideoItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/VideoItemViewModel.cs
similarity index 100%
rename from AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleViewModel/VideoItemViewModel.cs
rename to AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/VideoItemViewModel.cs
diff --git a/AIStudio.Wpf.Mind/Controls/MindEditor.xaml b/AIStudio.Wpf.Mind/Controls/MindEditor.xaml
index 44ea227..bbb67d5 100644
--- a/AIStudio.Wpf.Mind/Controls/MindEditor.xaml
+++ b/AIStudio.Wpf.Mind/Controls/MindEditor.xaml
@@ -20,7 +20,7 @@
                         <ContentControl x:Name="PART_ContentControl" Template="{Binding ToolBox,RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"/>
 
                         <!-- Diagram Control -->
-                        <dd:DiagramControl Grid.Row="1" x:Name="PART_DiagramControl" MinWidth="1000" MinHeight="1000" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
+                        <dd:DiagramControl Grid.Row="1" x:Name="PART_DiagramControl"  HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
 
                     </Grid>
                 </ControlTemplate>
diff --git a/AIStudio.Wpf.Mind/Controls/ToolBoxControl.xaml b/AIStudio.Wpf.Mind/Controls/ToolBoxControl.xaml
index 00ec2dd..30eeab5 100644
--- a/AIStudio.Wpf.Mind/Controls/ToolBoxControl.xaml
+++ b/AIStudio.Wpf.Mind/Controls/ToolBoxControl.xaml
@@ -514,7 +514,7 @@
                     <controls:DropDownButton Grid.Column="0">
                         <controls:DropDownButton.Content>
                             <StackPanel>
-                                <Path Width="18" Height="18" Stretch="Uniform" Fill="Black" Data="M290.816 774.144h167.936c12.288 0 20.48 8.192 20.48 20.48s-8.192 20.48-20.48 20.48h-219.136c-12.288 0-20.48-8.192-20.48-20.48v-2.048-206.848c0-12.288 8.192-20.48 20.48-20.48s20.48 8.192 20.48 20.48v163.84l210.944-198.656c8.192-8.192 20.48-8.192 28.672 0s8.192 20.48 0 28.672l-208.896 194.56z m462.848-524.288h-167.936c-12.288 0-20.48-8.192-20.48-20.48s8.192-20.48 20.48-20.48h219.136c12.288 0 20.48 8.192 20.48 20.48v208.896c0 12.288-8.192 20.48-20.48 20.48s-20.48-8.192-20.48-20.48v-163.84l-210.944 198.656c-8.192 8.192-20.48 8.192-28.672 0s-8.192-20.48 0-28.672l208.896-194.56z m188.416 323.584c0 12.288-8.192 20.48-20.48 20.48s-20.48-8.192-20.48-20.48v-389.12c0-34.816-26.624-61.44-61.44-61.44h-655.36c-34.816 0-61.44 26.624-61.44 61.44v655.36c0 34.816 26.624 61.44 61.44 61.44h655.36c34.816 0 61.44-26.624 61.44-61.44v-94.208c0-12.288 8.192-20.48 20.48-20.48s20.48 8.192 20.48 20.48v94.208c0 57.344-45.056 102.4-102.4 102.4h-655.36c-57.344 0-102.4-45.056-102.4-102.4v-655.36c0-57.344 45.056-102.4 102.4-102.4h655.36c57.344 0 102.4 45.056 102.4 102.4v389.12z"></Path>
+                                <Path Width="18" Height="18" Stretch="Uniform" Fill="Black" Data="M877.714286 768c0 21.942857-14.628571 36.571429-36.571429 36.571429h-585.142857c-21.942857 0-36.571429-14.628571-36.571429-36.571429v-585.142857c0-21.942857 14.628571-36.571429 36.571429-36.571429h585.142857c21.942857 0 36.571429 14.628571 36.571429 36.571429v585.142857zM841.142857 73.142857h-585.142857C197.485714 73.142857 146.285714 124.342857 146.285714 182.857143v585.142857c0 58.514286 51.2 109.714286 109.714286 109.714286h585.142857c58.514286 0 109.714286-51.2 109.714286-109.714286v-585.142857c0-58.514286-51.2-109.714286-109.714286-109.714286z m-146.285714 365.714286H585.142857V329.142857c0-21.942857-14.628571-36.571429-36.571428-36.571428s-36.571429 14.628571-36.571429 36.571428V438.857143H402.285714c-21.942857 0-36.571429 14.628571-36.571428 36.571428s14.628571 36.571429 36.571428 36.571429H512v109.714286c0 21.942857 14.628571 36.571429 36.571429 36.571428s36.571429-14.628571 36.571428-36.571428V512h109.714286c21.942857 0 36.571429-14.628571 36.571428-36.571429S716.8 438.857143 694.857143 438.857143z"></Path>
                                 <TextBlock>展开</TextBlock>
                             </StackPanel>
                         </controls:DropDownButton.Content>
@@ -543,7 +543,40 @@
                             <MenuItem Header="选择子树" IsCheckable="True" Command="{Binding SelectChildCommand}" />
                         </controls:DropDownButton.Items>
                     </controls:DropDownButton>
-                    <Button Style="{StaticResource FlatButtonStyle}" Grid.Column="3" Command="{Binding AddChildCommand}">
+                    <Line Grid.Column="2" X1="0" Y1="0" X2="0" Y2="100" StrokeDashArray="1" Stroke="Gray"  StrokeThickness="1"></Line>
+                    <StackPanel Orientation="Horizontal" Grid.Column="3" >
+                        <Button Style="{StaticResource FlatButtonStyle}" Grid.Column="4" Command="{Binding CenterMoveCommand}">
+                            <StackPanel>
+                                <Path Width="18" Height="18" Stretch="Uniform" Fill="Black" Data="M256 320c35 0 64 -29 64 -64s-29 -64 -64 -64s-64 29 -64 64s29 64 64 64zM405 107v85h43v-85c0 -23 -20 -43 -43 -43h-85v43h85zM405 448c23 0 43 -20 43 -43v-85h-43v85h-85v43h85zM107 405v-85h-43v85c0 23 20 43 43 43h85v-43h-85zM107 192v-85h85v-43h-85 c-23 0 -43 20 -43 43v85h43z"></Path>
+                                <TextBlock>居中</TextBlock>
+                            </StackPanel>
+                        </Button>
+                        <Button Style="{StaticResource FlatButtonStyle}" Grid.Column="4" Command="{Binding FitAutoCommand}">
+                            <StackPanel>
+                                <Path Width="18" Height="18" Stretch="Uniform" Fill="Black" RenderTransformOrigin="0.5,0.5" Data="M1023.216289 841.246459v9.61262a268.243293 268.243293 0 0 1-1.9339 51.191468 145.725046 145.725046 0 0 1-48.0631 85.66039 153.233128 153.233128 0 0 1-65.126924 31.681831 126.897961 126.897961 0 0 1-40.441259 2.218297H175.769975a293.611509 293.611509 0 0 1-66.776427-3.640282 142.198522 142.198522 0 0 1-100.221518-91.348331A239.291674 239.291674 0 0 1 0.524516 846.081209V193.560629 132.472144a164.950286 164.950286 0 0 1 16.551908-56.253736A147.886463 147.886463 0 0 1 93.806746 8.930067a155.735822 155.735822 0 0 1 26.505805-6.768649L134.077368 0.739432h734.654446a108.070877 108.070877 0 0 1 34.127646 1.421986 152.607454 152.607454 0 0 1 65.980114 29.122257 146.180081 146.180081 0 0 1 51.191468 84.522802 254.819752 254.819752 0 0 1 2.787091 55.116147V841.417097zM942.618167 129.457535a65.126923 65.126923 0 0 0-22.751764-35.322113 53.011609 53.011609 0 0 0-50.395156-13.025385H138.798359l-5.687941 0.568794-13.821696 3.697162a64.956285 64.956285 0 0 0-31.169917 26.847081 120.29995 120.29995 0 0 0-8.816308 61.657279v661.735044a245.548409 245.548409 0 0 0 1.9339 57.391324 63.648059 63.648059 0 0 0 41.920124 44.934733 172.060212 172.060212 0 0 0 45.844804 2.843971h702.858857a54.149197 54.149197 0 0 0 23.661834-1.421986 73.033161 73.033161 0 0 0 29.520413-16.096872 98.515136 98.515136 0 0 0 19.623396-81.166917V174.16475a199.077931 199.077931 0 0 0-2.047658-44.707215z m-116.090874 694.781981a37.085375 37.085375 0 0 1-19.850914 20.362828h-0.511915a36.232184 36.232184 0 0 1-13.366661 2.730212H597.75831a36.516581 36.516581 0 0 1-31.681831-18.713326 38.052325 38.052325 0 0 1 0-37.369772 36.516581 36.516581 0 0 1 31.681831-18.713325h106.762651l-120.413709-123.030162a37.881686 37.881686 0 0 1-9.953897-36.345942 36.914736 36.914736 0 0 1 26.107649-26.676443 35.890907 35.890907 0 0 1 35.549631 10.181414l120.413708 123.030162v-109.151586a37.54041 37.54041 0 0 1 18.258291-32.364384 36.004666 36.004666 0 0 1 36.57346 0 37.54041 37.54041 0 0 1 18.25829 32.364384v199.419208a37.199133 37.199133 0 0 1-2.559573 13.594179zM402.775696 249.359329H296.297442l120.35683 123.087041a37.938566 37.938566 0 0 1 9.498861 36.118425 36.971616 36.971616 0 0 1-25.880131 26.448925 36.004666 36.004666 0 0 1-35.322113-9.6695L244.59406 302.2003v109.151586a37.654169 37.654169 0 0 1-18.31517 32.421263 36.004666 36.004666 0 0 1-36.57346 0 37.711048 37.711048 0 0 1-18.25829-32.421263V211.989557a36.857857 36.857857 0 0 1 2.616452-13.594178v-0.625674a36.914736 36.914736 0 0 1 19.907794-20.305949h0.568794a34.525801 34.525801 0 0 1 13.309781-2.673332h195.039494a36.459701 36.459701 0 0 1 31.681831 18.656446 38.166083 38.166083 0 0 1 0 37.426651 36.459701 36.459701 0 0 1-31.79559 18.485808z">
+                                    <Path.RenderTransform>
+                                        <ScaleTransform ScaleY="-1"/>
+                                    </Path.RenderTransform>
+                                </Path>
+                                <TextBlock>适应窗口大小</TextBlock>
+                            </StackPanel>
+                        </Button>
+                        <Button Style="{StaticResource FlatButtonStyle}" Grid.Column="4" Command="{Binding FitWidthCommand}">
+                            <StackPanel>
+                                <Path Width="18" Height="18" Stretch="Uniform" Fill="Black" Data="M113.777 819.198 113.777 204.8c0-50.267 40.75-91.022 91.02-91.022l614.376 0c50.29 0 91.045 40.755 91.045 91.022l0 614.398c0 50.27-40.755 91.02-91.045 91.02L204.797 910.218C154.527 910.218 113.777 869.468 113.777 819.198zM796.438 841.953c25.125 0 45.51-20.385 45.51-45.51L841.948 227.554c0-25.122-20.385-45.51-45.505-45.51L227.552 182.044c-25.125 0-45.535 20.387-45.535 45.51l0 568.889c0 25.125 20.39 45.51 45.535 45.51L796.438 841.953zM623.043 603.269l57.115-57.14L344.357 546.129l55.5 55.505c13.31 13.335 13.335 34.93 0 48.265-13.335 13.33-34.95 13.33-48.29 0l-105.765-105.77c-3.415-1.615-6.78-3.525-9.625-6.37-7.08-7.1-10.1-16.475-9.67-25.76-0.46-9.262 2.59-18.66 9.69-25.76 2.85-2.842 6.15-4.8 9.58-6.348l105.79-105.79c13.34-13.335 34.955-13.335 48.29 0 13.31 13.332 13.335 34.927 0 48.262l-55.5 55.502 335.802 0-57.115-57.117c-13.355-13.335-13.335-34.952 0-48.287s34.93-13.335 48.265 0l115.37 115.395c13.335 13.332 13.36 34.927 0 48.262l-115.37 115.395c-13.335 13.335-34.95 13.335-48.265 0C609.708 638.198 609.708 616.583 623.043 603.269z"></Path>
+                                <TextBlock>适应窗口宽度</TextBlock>
+                            </StackPanel>
+                        </Button>
+                        <Button Style="{StaticResource FlatButtonStyle}" Grid.Column="4" Command="{Binding FitHeightCommand}">
+                            <StackPanel>
+                                <Path Width="18" Height="18" Stretch="Uniform" Fill="Black" Data="M819.198 910.218 204.799 910.218c-50.267 0-91.022-40.75-91.022-91.02L113.777 204.822c0-50.29 40.755-91.045 91.022-91.045l614.398 0c50.27 0 91.02 40.755 91.02 91.045l0 614.376C910.218 869.468 869.468 910.218 819.198 910.218zM841.953 227.554c0-25.122-20.385-45.51-45.51-45.51L227.554 182.044c-25.122 0-45.51 20.387-45.51 45.51l0 568.889c0 25.125 20.387 45.535 45.51 45.535l568.889 0c25.125 0 45.51-20.39 45.51-45.535L841.953 227.554zM603.268 400.952l-57.14-57.115 0 335.802 55.505-55.5c13.335-13.31 34.93-13.335 48.265 0 13.33 13.335 13.33 34.95 0 48.29l-105.77 105.765c-1.615 3.415-3.525 6.78-6.37 9.625-7.1 7.08-16.475 10.1-25.76 9.67-9.262 0.46-18.66-2.59-25.76-9.69-2.842-2.85-4.8-6.15-6.347-9.58l-105.79-105.79c-13.335-13.34-13.335-34.955 0-48.29 13.332-13.31 34.927-13.335 48.262 0l55.502 55.5L477.865 343.837l-57.117 57.115c-13.335 13.357-34.952 13.335-48.287 0s-13.335-34.93 0-48.265l115.395-115.37c13.332-13.335 34.927-13.357 48.262 0l115.395 115.37c13.335 13.335 13.335 34.952 0 48.265C638.198 414.286 616.583 414.286 603.268 400.952z"></Path>
+                                <TextBlock>适应窗口高度</TextBlock>
+                            </StackPanel>
+                        </Button>
+                       
+                    </StackPanel>
+                    <Line Grid.Column="4" X1="0" Y1="0" X2="0" Y2="100" StrokeDashArray="1" Stroke="Gray"  StrokeThickness="1"></Line>
+                    <Button Style="{StaticResource FlatButtonStyle}" Grid.Column="5" Command="{Binding AddChildCommand}">
                         <StackPanel>
                             <Path Width="18" Height="18" Stretch="Uniform" Fill="Black" Data="M911.958045 890.721335l-241.415018-246.54112a336.369964 336.369964 0 1 0-58.095828 45.158522l247.029321 252.643623a36.859118 36.859118 0 0 0 51.749225 0 37.103218 37.103218 0 0 0 0.7323-51.261025zM176.240286 404.473897a261.431228 261.431228 0 1 1 261.431228 261.431228A261.675328 261.675328 0 0 1 176.240286 404.473897z"></Path>
                             <TextBlock>搜索</TextBlock>
diff --git a/AIStudio.Wpf.Mind/ViewModels/MindDiagramViewModel.cs b/AIStudio.Wpf.Mind/ViewModels/MindDiagramViewModel.cs
index 506422a..05c838d 100644
--- a/AIStudio.Wpf.Mind/ViewModels/MindDiagramViewModel.cs
+++ b/AIStudio.Wpf.Mind/ViewModels/MindDiagramViewModel.cs
@@ -589,7 +589,7 @@ namespace AIStudio.Wpf.Mind.ViewModels
                 return false;
             }
 
-            nodes = nodes.Except(new List<MindNode>{ RootItem }).ToList();
+            nodes = nodes.Except(new List<MindNode> { RootItem }).ToList();
 
             if (nodes.Any())
             {
@@ -597,14 +597,14 @@ namespace AIStudio.Wpf.Mind.ViewModels
                 DoCommandManager.DoNewCommand(this.ToString(),
                   () => {
                       foreach (var node in nodes)
-                      {                          
-                          node.ParentNode.RemoveChild(node, true);                         
+                      {
+                          node.ParentNode.RemoveChild(node, true);
                       }
                       RootItem.LayoutUpdated();
                   },
                   () => {
                       foreach (var node in nodes)
-                      {                          
+                      {
                           node.ParentNode.AddChild(node, indexs[node]);
                       }
                       RootItem.LayoutUpdated();
@@ -615,54 +615,62 @@ namespace AIStudio.Wpf.Mind.ViewModels
                 return false;
         }
 
+        protected override void ExecuteCenterMoveCommand(object parameter)
+        {
+            RootItem.Left = (PageSize.Width - RootItem.ItemWidth) / 2;
+            RootItem.Top = (PageSize.Height - RootItem.ItemHeight) / 2;
+            RootItem?.LayoutUpdated();
+            FitViewModel = new FitViewModel() { BoundingRect = RootItem.GetBounds() };
+        }
+
         private void ExecuteAddLinkCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteRemoveLinkCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteAddImageCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteRemoveImageCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteAddRemarkCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteRemoveRemarkCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteAddPriorityCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteAddRatioCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteAddTagCommand(object obj)
         {
-            
+
         }
 
         private void ExecuteRemoveTagCommand(object obj)
         {
-            
+
         }
 
         private void ExecutedChangeMindTypeCommand(object obj)
@@ -720,7 +728,7 @@ namespace AIStudio.Wpf.Mind.ViewModels
                       RootItem.LayoutUpdated();
                   },
                   () => {
-                     //ToDo
+                      //ToDo
                   });
             }
         }
@@ -729,7 +737,7 @@ namespace AIStudio.Wpf.Mind.ViewModels
         {
             if (parameter is MindNode node)
             {
-              
+
             }
             else
             {
@@ -738,43 +746,43 @@ namespace AIStudio.Wpf.Mind.ViewModels
 
             if (node != null)
             {
-            
+
             }
         }
 
         private void ExecutedPasteThemeCommand(object parameter)
         {
-            
+
         }
 
         private void ExecutedExpand2Level1Command(object obj)
         {
-            
+
         }
 
         private void ExecutedExpand2Level2Command(object obj)
         {
-            
+
         }
 
         private void ExecutedExpand2Level3Command(object obj)
         {
-            
+
         }
 
         private void ExecutedExpand2Level4Command(object obj)
         {
-            
+
         }
 
         private void ExecutedExpand2Level5Command(object obj)
         {
-            
+
         }
 
         private void ExecutedExpand2Level6Command(object obj)
         {
-            
+
         }
         #endregion
         protected override void ExecutedResetLayoutCommand(object obj)