diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index a07b93fd..da07d2c0 100644
Binary files a/Bin/net40/SunnyUI.Demo.exe and b/Bin/net40/SunnyUI.Demo.exe differ
diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index 0a4e7e84..597eb5ef 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/SunnyUI.Demo/Controls/FCheckBox.Designer.cs b/SunnyUI.Demo/Controls/FCheckBox.Designer.cs
index 8334021c..43c77df3 100644
--- a/SunnyUI.Demo/Controls/FCheckBox.Designer.cs
+++ b/SunnyUI.Demo/Controls/FCheckBox.Designer.cs
@@ -41,6 +41,7 @@ namespace Sunny.UI.Demo
             this.uiCheckBox3 = new Sunny.UI.UICheckBox();
             this.uiLine1 = new Sunny.UI.UILine();
             this.uiCheckBox1 = new Sunny.UI.UICheckBox();
+            this.uiButton6 = new Sunny.UI.UIButton();
             this.SuspendLayout();
             // 
             // uiButton5
@@ -195,11 +196,24 @@ namespace Sunny.UI.Demo
             this.uiCheckBox1.Text = "uiCheckBox1";
             this.uiCheckBox1.CheckedChanged += new System.EventHandler(this.uiCheckBox1_CheckedChanged);
             // 
+            // uiButton6
+            // 
+            this.uiButton6.Cursor = System.Windows.Forms.Cursors.Hand;
+            this.uiButton6.Font = new System.Drawing.Font("微软雅黑", 12F);
+            this.uiButton6.Location = new System.Drawing.Point(560, 345);
+            this.uiButton6.MinimumSize = new System.Drawing.Size(1, 1);
+            this.uiButton6.Name = "uiButton6";
+            this.uiButton6.Size = new System.Drawing.Size(100, 35);
+            this.uiButton6.TabIndex = 58;
+            this.uiButton6.Text = "单选";
+            this.uiButton6.Click += new System.EventHandler(this.uiButton6_Click);
+            // 
             // FCheckBox
             // 
             this.AllowShowTitle = true;
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
             this.ClientSize = new System.Drawing.Size(800, 521);
+            this.Controls.Add(this.uiButton6);
             this.Controls.Add(this.uiButton5);
             this.Controls.Add(this.uiButton4);
             this.Controls.Add(this.uiButton3);
@@ -233,5 +247,6 @@ namespace Sunny.UI.Demo
         private UICheckBox uiCheckBox3;
         private UILine uiLine1;
         private UICheckBox uiCheckBox1;
+        private UIButton uiButton6;
     }
 }
\ No newline at end of file
diff --git a/SunnyUI.Demo/Controls/FCheckBox.cs b/SunnyUI.Demo/Controls/FCheckBox.cs
index e17dbdbf..8393e9c7 100644
--- a/SunnyUI.Demo/Controls/FCheckBox.cs
+++ b/SunnyUI.Demo/Controls/FCheckBox.cs
@@ -54,5 +54,10 @@ namespace Sunny.UI.Demo
         {
             Console.WriteLine(uiCheckBox1.Checked);
         }
+
+        private void uiButton6_Click(object sender, EventArgs e)
+        {
+            uiCheckBoxGroup1[4] = !uiCheckBoxGroup1[4];
+        }
     }
 }
diff --git a/SunnyUI/Controls/UICheckBoxGroup.cs b/SunnyUI/Controls/UICheckBoxGroup.cs
index 6e41afe9..6e825df5 100644
--- a/SunnyUI/Controls/UICheckBoxGroup.cs
+++ b/SunnyUI/Controls/UICheckBoxGroup.cs
@@ -62,6 +62,12 @@ namespace Sunny.UI
             Invalidate();
         }
 
+        public bool this[int index]
+        {
+            get => GetItemCheckState(index);
+            set => SetItemCheckState(index, value);
+        }
+
         /// <summary>
         /// 析构事件
         /// </summary>
@@ -185,6 +191,22 @@ namespace Sunny.UI
             }
         }
 
+        public void SetItemCheckState(int index, bool isChecked)
+        {
+            if (index >= 0 && index < boxes.Count)
+            {
+                boxes[index].Checked = isChecked;
+            }
+        }
+
+        public bool GetItemCheckState(int index)
+        {
+            if (index >= 0 && index < items.Count)
+                return boxes[index].Checked;
+
+            return false;
+        }
+
         //[Browsable(false)]
         //public List<string> SelectedItems
         //{
@@ -207,15 +229,15 @@ namespace Sunny.UI
         {
             get
             {
-                List<object> items = new List<object>();
+                List<object> objects = new List<object>();
 
                 for (int i = 0; i < boxes.Count; i++)
                 {
                     if (boxes[i].Checked)
-                        items.Add(Items[i]);
+                        objects.Add(Items[i]);
                 }
 
-                return items;
+                return objects;
             }
         }
 
diff --git a/SunnyUI/SunnyUI.csproj b/SunnyUI/SunnyUI.csproj
index d632da6d..86169337 100644
--- a/SunnyUI/SunnyUI.csproj
+++ b/SunnyUI/SunnyUI.csproj
@@ -54,10 +54,6 @@
     <EmbeddedResource Include="Font\fa-solid-900.ttf" />
     <EmbeddedResource Include="Font\FontAwesome.ttf" />
 </ItemGroup>
- 
-<ItemGroup>
-    <PackageReference Include="SunnyUI.Common" Version="3.0.8" />
-</ItemGroup>
 
 <ItemGroup Condition="'$(TargetFramework)' == 'net40'">
     <Reference Include="System.Windows.Forms" />
@@ -71,6 +67,10 @@
     <Reference Include="System.Design" />
 </ItemGroup>
 
+<ItemGroup>
+  <PackageReference Include="SunnyUI.Common" Version="3.0.8" />
+</ItemGroup>
+
 <ItemGroup>
     <Compile Update="Properties\Resources.Designer.cs">
         <DesignTime>True</DesignTime>