diff --git a/core/src/main/java/com/alibaba/testable/core/constant/ConstPool.java b/core/src/main/java/com/alibaba/testable/core/constant/ConstPool.java
index f757fdd..7e57555 100644
--- a/core/src/main/java/com/alibaba/testable/core/constant/ConstPool.java
+++ b/core/src/main/java/com/alibaba/testable/core/constant/ConstPool.java
@@ -15,6 +15,7 @@ public final class ConstPool {
     public static final String TESTABLE_PRIVATE_ACCESSOR = "com.alibaba.testable.core.accessor.PrivateAccessor";
     public static final String ANNOTATION_TESTABLE_INJECT = "com.alibaba.testable.core.annotation.TestableInject";
     public static final String TESTABLE_SETUP_METHOD_NAME = "testableSetup";
+    public static final String TESTABLE_REF_FIELD_NAME = "_testableInternalRef";
     public static final String TEST_POSTFIX = "Test";
 
 }
diff --git a/core/src/main/java/com/alibaba/testable/core/generator/TestableRefFieldGenerator.java b/core/src/main/java/com/alibaba/testable/core/generator/TestableRefFieldGenerator.java
new file mode 100644
index 0000000..0f78d5a
--- /dev/null
+++ b/core/src/main/java/com/alibaba/testable/core/generator/TestableRefFieldGenerator.java
@@ -0,0 +1,30 @@
+package com.alibaba.testable.core.generator;
+
+import com.alibaba.testable.core.constant.ConstPool;
+import com.alibaba.testable.core.model.TestableContext;
+import com.sun.tools.javac.tree.JCTree.JCModifiers;
+import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
+
+import java.lang.reflect.Modifier;
+
+/**
+ * Generate test class reference field
+ *
+ * @author flin
+ */
+public class TestableRefFieldGenerator extends BaseGenerator {
+
+    private final String testClassFullName;
+
+    public TestableRefFieldGenerator(TestableContext cx, String testClassFullName) {
+        super(cx);
+        this.testClassFullName = testClassFullName;
+    }
+
+    public JCVariableDecl fetch() {
+        JCModifiers mods = cx.treeMaker.Modifiers(Modifier.PUBLIC | Modifier.STATIC);
+        return cx.treeMaker.VarDef(mods, cx.names.fromString(ConstPool.TESTABLE_REF_FIELD_NAME),
+            nameToExpression(testClassFullName), null);
+    }
+
+}
diff --git a/core/src/main/java/com/alibaba/testable/core/processor/EnableTestableProcessor.java b/core/src/main/java/com/alibaba/testable/core/processor/EnableTestableProcessor.java
index b386e28..f927f42 100644
--- a/core/src/main/java/com/alibaba/testable/core/processor/EnableTestableProcessor.java
+++ b/core/src/main/java/com/alibaba/testable/core/processor/EnableTestableProcessor.java
@@ -48,18 +48,13 @@ public class EnableTestableProcessor extends BaseProcessor {
 
     private void processClassElement(Symbol.ClassSymbol clazz) {
         JCTree tree = cx.trees.getTree(clazz);
-        tree.accept(new EnableTestableTranslator(getPkgName(clazz), getOriginClassName(clazz), cx));
+        tree.accept(new EnableTestableTranslator(getPkgName(clazz), clazz.getSimpleName().toString(), cx));
     }
 
     private String getPkgName(Symbol.ClassSymbol clazz) {
         return ((Symbol.PackageSymbol)clazz.owner).fullname.toString();
     }
 
-    private String getOriginClassName(Symbol.ClassSymbol clazz) {
-        String testClassName = clazz.getSimpleName().toString();
-        return testClassName.substring(0, testClassName.length() - ConstPool.TEST_POSTFIX.length());
-    }
-
     private void createTestableAgentJar() {
         if (!hasFirstClassCompiled) {
             hasFirstClassCompiled = true;
diff --git a/core/src/main/java/com/alibaba/testable/core/translator/EnableTestableTranslator.java b/core/src/main/java/com/alibaba/testable/core/translator/EnableTestableTranslator.java
index 407e596..a07eba4 100644
--- a/core/src/main/java/com/alibaba/testable/core/translator/EnableTestableTranslator.java
+++ b/core/src/main/java/com/alibaba/testable/core/translator/EnableTestableTranslator.java
@@ -2,6 +2,7 @@ package com.alibaba.testable.core.translator;
 
 import com.alibaba.testable.core.generator.PrivateAccessStatementGenerator;
 import com.alibaba.testable.core.generator.TestSetupMethodGenerator;
+import com.alibaba.testable.core.generator.TestableRefFieldGenerator;
 import com.alibaba.testable.core.model.TestableContext;
 import com.alibaba.testable.core.constant.ConstPool;
 import com.sun.tools.javac.tree.JCTree;
@@ -23,20 +24,24 @@ import java.util.Arrays;
 public class EnableTestableTranslator extends BaseTranslator {
 
     private final TestableContext cx;
-    private String sourceClassName = "";
+    private String testClassName;
+    private String sourceClassName;
     private final ListBuffer<Name> sourceClassIns = new ListBuffer<>();
     private final ListBuffer<String> privateOrFinalFields = new ListBuffer<>();
     private final ListBuffer<String> privateMethods = new ListBuffer<>();
     private final TestSetupMethodGenerator testSetupMethodGenerator;
     private final PrivateAccessStatementGenerator privateAccessStatementGenerator;
+    private final TestableRefFieldGenerator testableRefFieldGenerator;
 
-    public EnableTestableTranslator(String pkgName, String className, TestableContext cx) {
-        this.sourceClassName = className;
+    public EnableTestableTranslator(String pkgName, String testClassName, TestableContext cx) {
+        this.testClassName = testClassName;
+        this.sourceClassName = testClassName.substring(0, testClassName.length() - ConstPool.TEST_POSTFIX.length());
         this.cx = cx;
         this.testSetupMethodGenerator = new TestSetupMethodGenerator(cx);
         this.privateAccessStatementGenerator = new PrivateAccessStatementGenerator(cx);
+        this.testableRefFieldGenerator = new TestableRefFieldGenerator(cx, pkgName + "." + testClassName);
         try {
-            Class<?> cls = Class.forName(pkgName + "." + className);
+            Class<?> cls = Class.forName(pkgName + "." + sourceClassName);
             Field[] fields = cls.getDeclaredFields();
             for (Field f : fields) {
                 if (Modifier.isFinal(f.getModifiers()) || Modifier.isPrivate(f.getModifiers())) {
@@ -104,10 +109,13 @@ public class EnableTestableTranslator extends BaseTranslator {
     @Override
     public void visitClassDef(JCClassDecl jcClassDecl) {
         super.visitClassDef(jcClassDecl);
-        ListBuffer<JCTree> ndefs = new ListBuffer<>();
-        ndefs.addAll(jcClassDecl.defs);
-        ndefs.add(testSetupMethodGenerator.fetch());
-        jcClassDecl.defs = ndefs.toList();
+        if (jcClassDecl.name.toString().equals(testClassName)) {
+            ListBuffer<JCTree> ndefs = new ListBuffer<>();
+            ndefs.addAll(jcClassDecl.defs);
+            ndefs.add(testSetupMethodGenerator.fetch());
+            ndefs.add(testableRefFieldGenerator.fetch());
+            jcClassDecl.defs = ndefs.toList();
+        }
     }
 
     /**