diff --git a/Editor/DynamicMemoryEncryption/DynamicMemoryEncryptionPass.cs b/Editor/DynamicMemoryEncryption/DynamicMemoryEncryptionPass.cs
deleted file mode 100644
index 9480a3c..0000000
--- a/Editor/DynamicMemoryEncryption/DynamicMemoryEncryptionPass.cs
+++ /dev/null
@@ -1,29 +0,0 @@
-using dnlib.DotNet;
-using dnlib.DotNet.Emit;
-using Obfuz;
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-
-public class DynamicMemoryEncryptionPass : MethodBodyObfuscationPassBase
-{
-    public override void Start(ObfuscatorContext ctx)
-    {
-
-    }
-
-    public override void Stop(ObfuscatorContext ctx)
-    {
-
-    }
-
-    protected override bool NeedObfuscateMethod(MethodDef method)
-    {
-        return true;
-    }
-
-    protected override bool TryObfuscateInstruction(MethodDef callingMethod, Instruction inst, IList<Instruction> instructions, int instructionIndex, List<Instruction> outputInstructions, List<Instruction> totalFinalInstructions)
-    {
-        throw new System.NotImplementedException();
-    }
-}
diff --git a/Editor/MemEncrypt/ConfigEncryptionPolicy.cs b/Editor/MemEncrypt/ConfigEncryptionPolicy.cs
new file mode 100644
index 0000000..3fd650f
--- /dev/null
+++ b/Editor/MemEncrypt/ConfigEncryptionPolicy.cs
@@ -0,0 +1,39 @@
+using dnlib.DotNet;
+
+namespace Obfuz.MemEncrypt
+{
+    public class ConfigEncryptionPolicy : EncryptionPolicyBase
+    {
+
+        private bool IsSupportedFieldType(TypeSig type)
+        {
+            type = type.RemovePinnedAndModifiers();
+            switch (type.ElementType)
+            {
+                case ElementType.I4:
+                case ElementType.I8:
+                case ElementType.U4:
+                case ElementType.U8:
+                case ElementType.R4:
+                case ElementType.R8:
+                    return true;
+                default: return false;
+            }
+        }
+
+        public override bool NeedEncrypt(FieldDef field)
+        {
+            TypeDef type = field.DeclaringType;
+            if (!IsSupportedFieldType(field.FieldType))
+            {
+                return false;
+            }
+            // TODO 
+            if (type.Name == "EncryptField" || type.Name == "EncryptProperty")
+            {
+                return true;
+            }
+            return false;
+        }
+    }
+}
diff --git a/Editor/MemEncrypt/EncryptionPolicyBase.cs b/Editor/MemEncrypt/EncryptionPolicyBase.cs
new file mode 100644
index 0000000..3552081
--- /dev/null
+++ b/Editor/MemEncrypt/EncryptionPolicyBase.cs
@@ -0,0 +1,9 @@
+using dnlib.DotNet;
+
+namespace Obfuz.MemEncrypt
+{
+    public abstract class EncryptionPolicyBase : IEncryptionPolicy
+    {
+        public abstract bool NeedEncrypt(FieldDef field);
+    }
+}
diff --git a/Editor/MemEncrypt/IEncryptionPolicy.cs b/Editor/MemEncrypt/IEncryptionPolicy.cs
new file mode 100644
index 0000000..fb167b5
--- /dev/null
+++ b/Editor/MemEncrypt/IEncryptionPolicy.cs
@@ -0,0 +1,14 @@
+using dnlib.DotNet;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Obfuz.MemEncrypt
+{
+    public interface IEncryptionPolicy
+    {
+        bool NeedEncrypt(FieldDef field);
+    }
+}
diff --git a/Editor/MemEncrypt/MemoryEncryptionPass.cs b/Editor/MemEncrypt/MemoryEncryptionPass.cs
new file mode 100644
index 0000000..06eb3b2
--- /dev/null
+++ b/Editor/MemEncrypt/MemoryEncryptionPass.cs
@@ -0,0 +1,90 @@
+using dnlib.DotNet;
+using dnlib.DotNet.Emit;
+using Obfuz;
+using Obfuz.MemEncrypt;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Obfuz.MemEncrypt
+{
+
+    public class MemoryEncryptionPass : MethodBodyObfuscationPassBase
+    {
+        private readonly IEncryptionPolicy _encryptionPolicy = new ConfigEncryptionPolicy();
+
+        public override void Start(ObfuscatorContext ctx)
+        {
+
+        }
+
+        public override void Stop(ObfuscatorContext ctx)
+        {
+
+        }
+
+        protected override bool NeedObfuscateMethod(MethodDef method)
+        {
+            return true;
+        }
+
+        private FieldDef TryResolveFieldDef(IField field)
+        {
+            if (field is FieldDef fieldDef)
+            {
+                return fieldDef;
+            }
+            if (field is MemberRef memberRef)
+            {
+                return memberRef.ResolveFieldDef();
+            }
+            throw new System.Exception($"Cannot resolve field: {field}");
+        }
+
+        protected override bool TryObfuscateInstruction(MethodDef callingMethod, Instruction inst, IList<Instruction> instructions, int instructionIndex, List<Instruction> outputInstructions, List<Instruction> totalFinalInstructions)
+        {
+            Code code = inst.OpCode.Code;
+            if (!(inst.Operand is IField field))
+            {
+                return false;
+            }
+            FieldDef fieldDef = TryResolveFieldDef(field);
+            if (fieldDef == null)
+            {
+                return false;
+            }
+            if (!_encryptionPolicy.NeedEncrypt(fieldDef))
+            {
+                return false;
+            }
+            switch (code)
+            {
+                case Code.Ldfld:
+                {
+                    break;
+                }
+                case Code.Stfld:
+                {
+                    break;
+                }
+                case Code.Ldsfld:
+                {
+                    break;
+                }
+                case Code.Stsfld:
+                {
+                    break;
+                }
+                case Code.Ldflda:
+                case Code.Ldsflda:
+                {
+                    throw new System.Exception($"You shouldn't get reference to memory encryption field: {field}");
+                }
+                default: return false;
+            }
+            Debug.Log($"memory encrypt field: {field}");
+            outputInstructions.Add(inst);
+            return true;
+        }
+    }
+}
diff --git a/Editor/Obfuscator.cs b/Editor/Obfuscator.cs
index 40cc3a6..4c6808d 100644
--- a/Editor/Obfuscator.cs
+++ b/Editor/Obfuscator.cs
@@ -46,6 +46,7 @@ namespace Obfuz
             _obfuscationAssemblyNames = options.obfuscationAssemblyNames;
             _assemblyCache = new AssemblyCache(new PathAssemblyResolver(options.assemblySearchDirs.ToArray()));
 
+            _pipeline.AddPass(new MemoryEncryptionPass());
             _pipeline.AddPass(new ProxyCallPass());
             _pipeline.AddPass(new ExprObfuscationPass());
             _pipeline.AddPass(new DataVirtualizationPass());