diff --git a/AIStudio.Wpf.DiagramDesigner/AIStudio.Wpf.DiagramDesigner.csproj b/AIStudio.Wpf.DiagramDesigner/AIStudio.Wpf.DiagramDesigner.csproj
index 5c56737..83c64dd 100644
--- a/AIStudio.Wpf.DiagramDesigner/AIStudio.Wpf.DiagramDesigner.csproj
+++ b/AIStudio.Wpf.DiagramDesigner/AIStudio.Wpf.DiagramDesigner.csproj
@@ -31,6 +31,7 @@
     <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.31" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="SvgPathProperties" Version="1.1.2" />
+    <PackageReference Include="System.Drawing.Common" Version="6.0.0" />
     <PackageReference Include="System.Management" Version="7.0.0" />
     <PackageReference Include="System.Reactive" Version="5.0.0" />
     <PackageReference Include="WpfAnimatedGif" Version="2.0.0" />
diff --git a/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs b/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
index 5d9f111..5602648 100644
--- a/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
@@ -11,7 +11,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         public ConstParameter(ConstParameterItem item) 
         {
             Text = item.Text;
-            Value = item.Value.ToString();
+            Value = item.Value?.ToString();
         }
 
         private string _text;
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Container/BlockItemsContainerInfo.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Container/BlockItemsContainerInfo.cs
index c0e10dc..b0d4df7 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Container/BlockItemsContainerInfo.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Container/BlockItemsContainerInfo.cs
@@ -351,5 +351,15 @@ namespace AIStudio.Wpf.DiagramDesigner
                 return null;
             }
         }
+
+        public override void Dispose()
+        {
+            base.Dispose();
+
+            foreach (var child in Children)
+            {
+                child.Dispose();
+            }
+        }
     }
 }
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
index efb7a0a..5b2f417 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
@@ -530,6 +530,19 @@ namespace AIStudio.Wpf.DiagramDesigner
             return null;
         }
         #endregion
+
+        public override void Dispose()
+        {
+            base.Dispose();
+
+            if (ParentContainer == null)
+            {
+                foreach (var container in Containers)
+                {
+                    container.Dispose();
+                }
+            }
+        }
     }
 
     #region 扩展