diff --git a/PublicTypes/InjectVariable/CStyle.cs b/PublicTypes/InjectVariable/CStyle.cs
index ba162f1..31142b9 100644
--- a/PublicTypes/InjectVariable/CStyle.cs
+++ b/PublicTypes/InjectVariable/CStyle.cs
@@ -7,7 +7,7 @@ using System.Threading.Tasks;
 
 namespace Convention.RScript.Variable.CStyle
 {
-    public class RScriptInjectVariable : Variable.RScriptInjectVariable
+    public class RScriptVariableGenerater : RScriptInjectVariableGenerater
     {
         public static string GetTypename(Type type)
         {
@@ -18,7 +18,7 @@ namespace Convention.RScript.Variable.CStyle
         private int layer = 0;
         private string Prefix => new('\t', layer);
 
-        public RScriptInjectVariable(Type targetType, [MaybeNull] Generater generater, string name) : base(targetType, generater, name)
+        public RScriptVariableGenerater(Type targetType, [MaybeNull] Generater generater, string name) : base(targetType, generater, name)
         {
         }
 
diff --git a/PublicTypes/RScriptInjectVariable.cs b/PublicTypes/RScriptInjectVariableGenerater.cs
similarity index 84%
rename from PublicTypes/RScriptInjectVariable.cs
rename to PublicTypes/RScriptInjectVariableGenerater.cs
index 59bbe84..5fb3bea 100644
--- a/PublicTypes/RScriptInjectVariable.cs
+++ b/PublicTypes/RScriptInjectVariableGenerater.cs
@@ -19,9 +19,19 @@ namespace Convention.RScript.Variable
         public sealed class EnumAttribute : Attribute
         {
         }
+
+        [AttributeUsage(AttributeTargets.Class|AttributeTargets.Struct, Inherited = false, AllowMultiple = false)]
+        public sealed class DefaultAttribute : Attribute
+        {
+            public string defaultScript;
+            public DefaultAttribute(string defaultScript)
+            {
+                this.defaultScript = defaultScript;
+            }
+        }
     }
 
-    public abstract class RScriptInjectVariable
+    public abstract class RScriptInjectVariableGenerater
     {
         public string RScriptString { get; private set; }
 
@@ -59,18 +69,19 @@ namespace Convention.RScript.Variable
 
         private Generater MyGenerater;
 
-        public readonly static Dictionary<string, RScriptInjectVariable> AllRScriptInjectVariables = new();
+        public readonly static Dictionary<string, RScriptInjectVariableGenerater> AllRScriptInjectVariables = new();
 
         public readonly Type targetType;
         public readonly string name;
-        public readonly string script;
+        public readonly string scriptIndicator;
+        public readonly string defaultScript;
 
         public object Generate()
         {
             return MyGenerater();
         }
 
-        public RScriptInjectVariable(Type targetType, [MaybeNull] Generater generater, string name)
+        public RScriptInjectVariableGenerater(Type targetType, [MaybeNull] Generater generater, string name)
         {
             if (AllRScriptInjectVariables.TryGetValue(name, out var exist_var))
             {
@@ -80,7 +91,9 @@ namespace Convention.RScript.Variable
                 }
                 this.targetType = exist_var.targetType;
                 this.name = exist_var.name;
-                this.script = exist_var.script;
+                this.scriptIndicator = exist_var.scriptIndicator;
+                this.defaultScript = exist_var.defaultScript;
+
             }
             else
             {
@@ -125,12 +138,14 @@ namespace Convention.RScript.Variable
                 builder.AppendLine(this.WriteClassBodyExit(targetType));
                 builder.AppendLine(this.WriteClassTail(targetType));
                 builder.AppendLine(this.WritePageEnd(targetType));
-                this.script = builder.ToString();
+                this.scriptIndicator = builder.ToString();
             }
 
             this.targetType = targetType;
             this.MyGenerater = generater;
             this.name = name;
+            var defaultAttr = targetType.GetCustomAttribute<Attr.DefaultAttribute>();
+            this.defaultScript = defaultAttr?.defaultScript;
         }
 
         public static object GenerateRScriptVariable(string name)
@@ -154,7 +169,7 @@ namespace Convention.RScript.Variable
     {
         public static object New(string name)
         {
-            return RScriptInjectVariable.GenerateRScriptVariable(name);
+            return RScriptInjectVariableGenerater.GenerateRScriptVariable(name);
         }
     }
 }