diff --git a/agent/src/main/java/com/alibaba/testable/agent/constant/ConstPool.java b/agent/src/main/java/com/alibaba/testable/agent/constant/ConstPool.java
index b1d2755..f8cd50b 100644
--- a/agent/src/main/java/com/alibaba/testable/agent/constant/ConstPool.java
+++ b/agent/src/main/java/com/alibaba/testable/agent/constant/ConstPool.java
@@ -1,8 +1,5 @@
 package com.alibaba.testable.agent.constant;
 
-import java.util.ArrayList;
-import java.util.List;
-
 /**
  * @author flin
  */
@@ -13,9 +10,6 @@ public class ConstPool {
 
     public static final String TEST_POSTFIX = "Test";
 
-    public static final List<String> SYS_CLASSES = new ArrayList<String>();
-    static {
-        SYS_CLASSES.add("java/lang/StringBuilder");
-    }
-
+    public static final String ENABLE_TESTABLE = "com.alibaba.testable.core.annotation.EnableTestable";
+    public static final String TESTABLE_INJECT = "com.alibaba.testable.core.annotation.TestableInject";
 }
diff --git a/agent/src/main/java/com/alibaba/testable/agent/handler/SourceClassHandler.java b/agent/src/main/java/com/alibaba/testable/agent/handler/SourceClassHandler.java
index 102f13e..e76e1b3 100644
--- a/agent/src/main/java/com/alibaba/testable/agent/handler/SourceClassHandler.java
+++ b/agent/src/main/java/com/alibaba/testable/agent/handler/SourceClassHandler.java
@@ -1,12 +1,15 @@
 package com.alibaba.testable.agent.handler;
 
 import com.alibaba.testable.agent.constant.ConstPool;
+import com.alibaba.testable.agent.model.MethodInfo;
 import com.alibaba.testable.agent.util.ClassUtil;
+import com.alibaba.testable.agent.util.CollectionUtil;
 import com.alibaba.testable.agent.util.StringUtil;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.Type;
 import org.objectweb.asm.tree.*;
 
+import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -24,33 +27,42 @@ public class SourceClassHandler extends ClassHandler {
     private static final String METHOD_DESC_PREFIX = "(Ljava/lang/Object;Ljava/lang/String;";
     private static final String OBJECT_DESC = "Ljava/lang/Object;";
     private static final String METHOD_DESC_POSTFIX = ")Ljava/lang/Object;";
+    private List<MethodInfo> injectMethods;
+
+    public SourceClassHandler(List<MethodInfo> injectMethods) {
+        this.injectMethods = injectMethods;
+    }
 
     @Override
     protected void transform(ClassNode cn) {
-        Set<String> methodNames = new HashSet<String>();
+        List<MethodInfo> methods = new ArrayList<MethodInfo>();
         for (MethodNode m : cn.methods) {
             if (!CONSTRUCTOR.equals(m.name)) {
-                methodNames.add(m.name);
+                methods.add(new MethodInfo(m.name, m.desc));
             }
         }
+        Set<MethodInfo> memberInjectMethods = CollectionUtil.getCrossSet(methods, injectMethods);
+        Set<MethodInfo> newOperatorInjectMethods = CollectionUtil.getMinusSet(injectMethods, memberInjectMethods);
         for (MethodNode m : cn.methods) {
-            transformMethod(cn, m, methodNames);
+            transformMethod(cn, m, memberInjectMethods, MethodInfo.descSet(newOperatorInjectMethods));
         }
     }
 
-    private void transformMethod(ClassNode cn, MethodNode mn, Set<String> methodNames) {
+    private void transformMethod(ClassNode cn, MethodNode mn, Set<MethodInfo> memberInjectMethods,
+                                 Set<String> newOperatorInjectDesc) {
         AbstractInsnNode[] instructions = mn.instructions.toArray();
         int i = 0;
         do {
             if (instructions[i].getOpcode() == Opcodes.INVOKESPECIAL) {
                 MethodInsnNode node = (MethodInsnNode)instructions[i];
-                if (cn.name.equals(node.owner) && methodNames.contains(node.name)) {
+                if (cn.name.equals(node.owner) && memberInjectMethods.contains(new MethodInfo(node.name, node.desc))) {
                     int rangeStart = getMemberMethodStart(instructions, i);
                     if (rangeStart >= 0) {
                         instructions = replaceMemberCallOps(mn, instructions, rangeStart, i);
                         i = rangeStart;
                     }
-                } else if (CONSTRUCTOR.equals(node.name) && !ConstPool.SYS_CLASSES.contains(node.owner)) {
+                } else if (CONSTRUCTOR.equals(node.name) &&
+                    newOperatorInjectDesc.contains(getConstructorInjectDesc(node))) {
                     int rangeStart = getConstructorStart(instructions, node.owner, i);
                     if (rangeStart >= 0) {
                         instructions = replaceNewOps(mn, instructions, rangeStart, i);
@@ -62,6 +74,11 @@ public class SourceClassHandler extends ClassHandler {
         } while (i < instructions.length);
     }
 
+    private String getConstructorInjectDesc(MethodInsnNode constructorNode) {
+        return constructorNode.desc.substring(0, constructorNode.desc.length() - 1) +
+            ClassUtil.toByteCodeClassName(constructorNode.owner);
+    }
+
     private int getConstructorStart(AbstractInsnNode[] instructions, String target, int rangeEnd) {
         for (int i = rangeEnd - 1; i >= 0; i--) {
             if (instructions[i].getOpcode() == Opcodes.NEW && ((TypeInsnNode)instructions[i]).desc.equals(target)) {
diff --git a/agent/src/main/java/com/alibaba/testable/agent/model/MethodInfo.java b/agent/src/main/java/com/alibaba/testable/agent/model/MethodInfo.java
index d2ee60b..78716c4 100644
--- a/agent/src/main/java/com/alibaba/testable/agent/model/MethodInfo.java
+++ b/agent/src/main/java/com/alibaba/testable/agent/model/MethodInfo.java
@@ -1,26 +1,28 @@
 package com.alibaba.testable.agent.model;
 
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
 /**
  * @author flin
  */
 public class MethodInfo {
 
-    private int access;
     private String name;
     private String desc;
-    private String signature;
-    private String[] exceptions;
 
-    public MethodInfo(int access, String name, String desc, String signature, String[] exceptions) {
-        this.access = access;
+    public MethodInfo(String name, String desc) {
         this.name = name;
         this.desc = desc;
-        this.signature = signature;
-        this.exceptions = exceptions;
     }
 
-    public int getAccess() {
-        return access;
+    public static Set<String> descSet(Collection<MethodInfo> methodInfos) {
+        Set<String> set = new HashSet<String>();
+        for (MethodInfo m : methodInfos) {
+            set.add(m.desc);
+        }
+        return set;
     }
 
     public String getName() {
@@ -31,11 +33,21 @@ public class MethodInfo {
         return desc;
     }
 
-    public String getSignature() {
-        return signature;
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        MethodInfo that = (MethodInfo)o;
+        return name.equals(that.name) && desc.equals(that.desc);
     }
 
-    public String[] getExceptions() {
-        return exceptions;
+    @Override
+    public int hashCode() {
+        return 31 * name.hashCode() + desc.hashCode();
     }
+
 }
diff --git a/agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java b/agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
index 131ae05..98e7ccc 100644
--- a/agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
+++ b/agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
@@ -3,6 +3,7 @@ package com.alibaba.testable.agent.transformer;
 import com.alibaba.testable.agent.constant.ConstPool;
 import com.alibaba.testable.agent.handler.SourceClassHandler;
 import com.alibaba.testable.agent.handler.TestClassHandler;
+import com.alibaba.testable.agent.model.MethodInfo;
 import com.alibaba.testable.agent.util.ClassUtil;
 
 import java.io.IOException;
@@ -18,9 +19,6 @@ import java.util.Set;
  */
 public class TestableClassTransformer implements ClassFileTransformer {
 
-    private static final String ENABLE_TESTABLE = "com.alibaba.testable.core.annotation.EnableTestable";
-    private static final String ENABLE_TESTABLE_INJECT = "com.alibaba.testable.core.annotation.EnableTestableInject";
-
     private static final Set<String> loadedClassNames = new HashSet<String>();
 
     public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
@@ -33,10 +31,11 @@ public class TestableClassTransformer implements ClassFileTransformer {
         List<String> annotations = ClassUtil.getAnnotations(className);
         List<String> testAnnotations = ClassUtil.getAnnotations(className + ConstPool.TEST_POSTFIX);
         try {
-            if (annotations.contains(ENABLE_TESTABLE_INJECT) || testAnnotations.contains(ENABLE_TESTABLE)) {
+            if (testAnnotations.contains(ConstPool.ENABLE_TESTABLE)) {
                 loadedClassNames.add(className);
-                return new SourceClassHandler().getBytes(className);
-            } else if (annotations.contains(ENABLE_TESTABLE)) {
+                List<MethodInfo> injectMethods = ClassUtil.getTestableInjectMethods(className + ConstPool.TEST_POSTFIX);
+                return new SourceClassHandler(injectMethods).getBytes(className);
+            } else if (annotations.contains(ConstPool.ENABLE_TESTABLE)) {
                 loadedClassNames.add(className);
                 return new TestClassHandler().getBytes(className);
             }
diff --git a/agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java b/agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
index 386fdfb..54d1df0 100644
--- a/agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
+++ b/agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
@@ -1,9 +1,11 @@
 package com.alibaba.testable.agent.util;
 
 import com.alibaba.testable.agent.constant.ConstPool;
+import com.alibaba.testable.agent.model.MethodInfo;
 import org.objectweb.asm.ClassReader;
 import org.objectweb.asm.tree.AnnotationNode;
 import org.objectweb.asm.tree.ClassNode;
+import org.objectweb.asm.tree.MethodNode;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -37,8 +39,7 @@ public class ClassUtil {
             ClassNode cn = new ClassNode();
             new ClassReader(className).accept(cn, 0);
             for (AnnotationNode an : cn.visibleAnnotations) {
-                String annotationName = an.desc.replace(ConstPool.SLASH, ConstPool.DOT).substring(1, an.desc.length() - 1);
-                annotations.add(annotationName);
+                annotations.add(toDotSeparateFullClassName(an.desc));
             }
             return annotations;
         } catch (Exception e) {
@@ -46,6 +47,32 @@ public class ClassUtil {
         }
     }
 
+    public static List<MethodInfo> getTestableInjectMethods(String className) {
+        try {
+            List<MethodInfo> methodInfos = new ArrayList<MethodInfo>();
+            ClassNode cn = new ClassNode();
+            new ClassReader(className).accept(cn, 0);
+            for (MethodNode mn : cn.methods) {
+                checkMethodAnnotation(methodInfos, mn);
+            }
+            return methodInfos;
+        } catch (Exception e) {
+            return new ArrayList<MethodInfo>();
+        }
+    }
+
+    private static void checkMethodAnnotation(List<MethodInfo> methodInfos, MethodNode mn) {
+        if (mn.visibleAnnotations == null) {
+            return;
+        }
+        for (AnnotationNode an : mn.visibleAnnotations) {
+            if (toDotSeparateFullClassName(an.desc).equals(ConstPool.TESTABLE_INJECT)) {
+                methodInfos.add(new MethodInfo(mn.name, mn.desc));
+                break;
+            }
+        }
+    }
+
     public static List<Byte> getParameterTypes(String desc) {
         List<Byte> parameterTypes = new ArrayList<Byte>();
         boolean travelingClass = false;
@@ -101,4 +128,9 @@ public class ClassUtil {
     public static String toByteCodeClassName(String className) {
         return TYPE_CLASS + className.replace(ConstPool.DOT, ConstPool.SLASH) + CLASS_END;
     }
+
+    public static String toDotSeparateFullClassName(String className) {
+        return className.replace(ConstPool.SLASH, ConstPool.DOT).substring(1, className.length() - 1);
+    }
+
 }
diff --git a/agent/src/main/java/com/alibaba/testable/agent/util/CollectionUtil.java b/agent/src/main/java/com/alibaba/testable/agent/util/CollectionUtil.java
index 2450776..7656e09 100644
--- a/agent/src/main/java/com/alibaba/testable/agent/util/CollectionUtil.java
+++ b/agent/src/main/java/com/alibaba/testable/agent/util/CollectionUtil.java
@@ -1,18 +1,20 @@
 package com.alibaba.testable.agent.util;
 
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.List;
+import java.util.*;
 
 /**
  * @author flin
  */
 public class CollectionUtil {
 
-    public static boolean containsAny(Collection hostContainer, Collection itemsToFind) {
-        for (Object o : hostContainer) {
-            for (Object i : itemsToFind) {
+    /**
+     * Check two collection has any equaled item
+     * @param collectionLeft the first collection
+     * @param collectionRight the second collection
+     */
+    public static boolean containsAny(Collection collectionLeft, Collection collectionRight) {
+        for (Object o : collectionLeft) {
+            for (Object i : collectionRight) {
                 if (o.equals(i)) {
                     return true;
                 }
@@ -21,10 +23,44 @@ public class CollectionUtil {
         return false;
     }
 
+    /**
+     * Generate a list of item
+     * @param items elements to add
+     */
     public static <T> List<T> listOf(T... items) {
         List<T> list = new ArrayList<T>(items.length);
         Collections.addAll(list, items);
         return list;
     }
 
+    /**
+     * Get cross set of two collections
+     * @param collectionLeft the first collection
+     * @param collectionRight the second collection
+     */
+    public static <T> Set<T> getCrossSet(Collection<T> collectionLeft, Collection<T> collectionRight) {
+        Set<T> crossSet = new HashSet<T>();
+        for (T i : collectionLeft) {
+            if (collectionRight.contains(i)) {
+                crossSet.add(i);
+            }
+        }
+        return crossSet;
+    }
+
+    /**
+     * Get minus set of two collections
+     * @param collectionRaw original collection
+     * @param collectionMinus items to remove
+     */
+    public static <T> Set<T> getMinusSet(Collection<T> collectionRaw, Collection<T> collectionMinus) {
+        Set<T> crossSet = new HashSet<T>();
+        for (T i : collectionRaw) {
+            if (!collectionMinus.contains(i)) {
+                crossSet.add(i);
+            }
+        }
+        return crossSet;
+    }
+
 }
diff --git a/core/src/main/java/com/alibaba/testable/core/annotation/EnableTestableInject.java b/core/src/main/java/com/alibaba/testable/core/annotation/EnableTestableInject.java
index ead675b..16b1b1d 100644
--- a/core/src/main/java/com/alibaba/testable/core/annotation/EnableTestableInject.java
+++ b/core/src/main/java/com/alibaba/testable/core/annotation/EnableTestableInject.java
@@ -12,4 +12,9 @@ import java.lang.annotation.*;
 @Documented
 public @interface EnableTestableInject {
 
+    /**
+     * Test class names
+     */
+    String[] value();
+
 }
diff --git a/core/src/main/java/com/alibaba/testable/core/annotation/TestableInject.java b/core/src/main/java/com/alibaba/testable/core/annotation/TestableInject.java
index 74381d6..e047dec 100644
--- a/core/src/main/java/com/alibaba/testable/core/annotation/TestableInject.java
+++ b/core/src/main/java/com/alibaba/testable/core/annotation/TestableInject.java
@@ -7,7 +7,7 @@ import java.lang.annotation.*;
  *
  * @author flin
  */
-@Retention(RetentionPolicy.SOURCE)
+@Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.METHOD)
 @Documented
 public @interface TestableInject {