diff --git a/src/IFoxCAD.Cad/Runtime/CommandTool.cs b/src/IFoxCAD.Cad/Runtime/CommandTool.cs
new file mode 100644
index 0000000000000000000000000000000000000000..bb157c30b3e0a1154415808322dd1cf1095867fc
--- /dev/null
+++ b/src/IFoxCAD.Cad/Runtime/CommandTool.cs
@@ -0,0 +1,31 @@
+public static class CommandTool
+{
+    /// <summary>
+    /// 发送cmd指令
+    /// </summary>
+    /// <param name="CommandParameter">命令内容</param>
+    /// <param name="echoCommand">指示发送的字符串是否在命令行上回显</param>
+    internal static void SendCommand(string CommandParameter, bool echoCommand = false)
+    {
+        Document mdiActiveDocument = Application.DocumentManager.MdiActiveDocument;
+        SetFocus(mdiActiveDocument.Window.Handle);
+        if (mdiActiveDocument == null)
+            return;
+        if (CommandParameter.StartsWith("'"))
+        {
+            mdiActiveDocument.SendStringToExecute(CommandParameter + "\n", true, false, echoCommand);
+        }
+        else
+        {
+            string Left = Application.GetSystemVariable("cmdnames").ToString();
+            if (Left == "")
+                mdiActiveDocument.SendStringToExecute("_" + CommandParameter + "\n", true, false, echoCommand);
+            else if (Left.Length >= 4 && Left.Substring(0, 4).ToUpper() == "GRIP")
+                mdiActiveDocument.SendStringToExecute("_" + CommandParameter + "\n", true, false, echoCommand);
+            else
+                mdiActiveDocument.SendStringToExecute("\u0003\u0003_" + CommandParameter + "\n", true, false, echoCommand);
+        }
+    }
+    [System.Runtime.InteropServices.DllImport("user32.dll")]
+    private static extern IntPtr SetFocus(IntPtr hwnd);
+}
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