diff --git a/com.code-philosophy.obfuz/Editor/ObfusPasses/SymbolObfus/Policies/UnityRenamePolicy.cs b/com.code-philosophy.obfuz/Editor/ObfusPasses/SymbolObfus/Policies/UnityRenamePolicy.cs
index c404ff1..247ad24 100644
--- a/com.code-philosophy.obfuz/Editor/ObfusPasses/SymbolObfus/Policies/UnityRenamePolicy.cs
+++ b/com.code-philosophy.obfuz/Editor/ObfusPasses/SymbolObfus/Policies/UnityRenamePolicy.cs
@@ -125,17 +125,35 @@ namespace Obfuz.ObfusPasses.SymbolObfus.Policies
     "OnSubmit",
     "OnCancel",
 };
+
+        private bool IsUnitySourceGeneratedAssemblyType(TypeDef typeDef)
+        {
+            if (typeDef.Name.StartsWith("UnitySourceGeneratedAssemblyMonoScriptTypes_"))
+            {
+                return true;
+            }
+            if (typeDef.DeclaringType != null)
+            {
+                return IsUnitySourceGeneratedAssemblyType(typeDef.DeclaringType);
+            }
+            return false;
+        }
+
         public override bool NeedRename(TypeDef typeDef)
         {
             if (MetaUtil.IsScriptOrSerializableType(typeDef))
             {
                 return false;
             }
-            if (typeDef.FullName.StartsWith("UnitySourceGeneratedAssemblyMonoScriptTypes_"))
+            if (typeDef.Methods.Any(m => MetaUtil.HasRuntimeInitializeOnLoadMethodAttribute(m)))
             {
                 return false;
             }
-            if (typeDef.Methods.Any(m => MetaUtil.HasRuntimeInitializeOnLoadMethodAttribute(m)))
+            if (typeDef.IsEnum && MetaUtil.HasBlackboardEnumAttribute(typeDef))
+            {
+                return false;
+            }
+            if (IsUnitySourceGeneratedAssemblyType(typeDef))
             {
                 return false;
             }
@@ -144,7 +162,8 @@ namespace Obfuz.ObfusPasses.SymbolObfus.Policies
 
         public override bool NeedRename(MethodDef methodDef)
         {
-            if (MetaUtil.IsInheritFromUnityObject(methodDef.DeclaringType))
+            TypeDef typeDef = methodDef.DeclaringType;
+            if (MetaUtil.IsInheritFromUnityObject(typeDef))
             {
                 return !s_monoBehaviourEvents.Contains(methodDef.Name);
             }
@@ -152,7 +171,7 @@ namespace Obfuz.ObfusPasses.SymbolObfus.Policies
             {
                 return false;
             }
-            if (methodDef.DeclaringType.FullName.StartsWith("UnitySourceGeneratedAssemblyMonoScriptTypes_"))
+            if (IsUnitySourceGeneratedAssemblyType(typeDef))
             {
                 return false;
             }
@@ -166,7 +185,11 @@ namespace Obfuz.ObfusPasses.SymbolObfus.Policies
             {
                 return !MetaUtil.IsSerializableField(fieldDef);
             }
-            if (fieldDef.DeclaringType.FullName.StartsWith("UnitySourceGeneratedAssemblyMonoScriptTypes_"))
+            if (typeDef.IsEnum && MetaUtil.HasBlackboardEnumAttribute(typeDef))
+            {
+                return false;
+            }
+            if (IsUnitySourceGeneratedAssemblyType(typeDef))
             {
                 return false;
             }
diff --git a/com.code-philosophy.obfuz/Editor/Utils/MetaUtil.cs b/com.code-philosophy.obfuz/Editor/Utils/MetaUtil.cs
index 3103322..c4cf534 100644
--- a/com.code-philosophy.obfuz/Editor/Utils/MetaUtil.cs
+++ b/com.code-philosophy.obfuz/Editor/Utils/MetaUtil.cs
@@ -853,17 +853,22 @@ namespace Obfuz.Utils
 
         public static bool HasCompilerGeneratedAttribute(IHasCustomAttribute obj)
         {
-            return obj.CustomAttributes.Any(ca => ca.AttributeType.FullName == "System.Runtime.CompilerServices.CompilerGeneratedAttribute");
+            return obj.CustomAttributes.Find("System.Runtime.CompilerServices.CompilerGeneratedAttribute") != null;
         }
 
         public static bool HasEncryptFieldAttribute(IHasCustomAttribute obj)
         {
-            return obj.CustomAttributes.Any(ca => ca.AttributeType.FullName == "Obfuz.EncryptFieldAttribute");
+            return obj.CustomAttributes.Find("Obfuz.EncryptFieldAttribute") != null;
         }
 
         public static bool HasRuntimeInitializeOnLoadMethodAttribute(MethodDef method)
         {
-            return method.CustomAttributes.Any(ca => ca.AttributeType.FullName == "UnityEngine.RuntimeInitializeOnLoadMethodAttribute");
+            return method.CustomAttributes.Find("UnityEngine.RuntimeInitializeOnLoadMethodAttribute") != null;
+        }
+
+        public static bool HasBlackboardEnumAttribute(TypeDef typeDef)
+        {
+            return typeDef.CustomAttributes.Find("Unity.Behavior.BlackboardEnumAttribute") != null;
         }
     }
 }