diff --git a/testable-core/src/main/java/com/alibaba/testable/core/annotation/MockMethod.java b/testable-core/src/main/java/com/alibaba/testable/core/annotation/MockMethod.java
index 108848a..7733ace 100644
--- a/testable-core/src/main/java/com/alibaba/testable/core/annotation/MockMethod.java
+++ b/testable-core/src/main/java/com/alibaba/testable/core/annotation/MockMethod.java
@@ -1,5 +1,6 @@
 package com.alibaba.testable.core.annotation;
 
+import javax.lang.model.type.NullType;
 import java.lang.annotation.*;
 
 /**
@@ -18,4 +19,10 @@ public @interface MockMethod {
      */
     String targetMethod() default "";
 
+    /**
+     * explicit set target class instead of adding to parameter list
+     * @return target class type
+     */
+    Class<?> targetClass() default NullType.class;
+
 }