diff --git a/src/main/java/com/alibaba/testable/processor/CallSuperMethod.java b/src/main/java/com/alibaba/testable/processor/CallSuperMethod.java
new file mode 100644
index 0000000..ec229a5
--- /dev/null
+++ b/src/main/java/com/alibaba/testable/processor/CallSuperMethod.java
@@ -0,0 +1,42 @@
+package com.alibaba.testable.processor;
+
+import com.alibaba.testable.util.ConstPool;
+import com.alibaba.testable.util.StringUtil;
+import com.sun.tools.javac.tree.JCTree;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author flin
+ */
+public class CallSuperMethod {
+    private final JCTree.JCMethodDecl method;
+    private Object[] params;
+    private String statement;
+
+    public CallSuperMethod(JCTree.JCMethodDecl method) {this.method = method;}
+
+    public Object[] getParams() {
+        return params;
+    }
+
+    public String getStatement() {
+        return statement;
+    }
+
+    public CallSuperMethod invoke() {
+        params = new String[method.params.length()];
+        List<String> placeholders = new ArrayList<>();
+        for (int i = 0; i < method.params.length(); i++) {
+            params[i] = (method.params.get(i).name.toString());
+            placeholders.add("$N");
+        }
+        String call = "super";
+        if (!method.name.toString().equals(ConstPool.CONSTRUCTOR_NAME)) {
+            call += ("." + method.name.toString());
+        }
+        statement = call + "(" + StringUtil.join(placeholders, ", ") + ")";
+        return this;
+    }
+}
diff --git a/src/main/java/com/alibaba/testable/processor/TestableProcessor.java b/src/main/java/com/alibaba/testable/processor/TestableProcessor.java
index 165550e..82bb1cc 100644
--- a/src/main/java/com/alibaba/testable/processor/TestableProcessor.java
+++ b/src/main/java/com/alibaba/testable/processor/TestableProcessor.java
@@ -35,7 +35,6 @@ public class TestableProcessor extends BaseProcessor {
             String packageName = elementUtils.getPackageOf(classElement).getQualifiedName().toString();
             String testableTypeName = classElement.getSimpleName().toString().replace(".", "_") + "Testable";
             String fullQualityTypeName =  packageName + "." + testableTypeName;
-            info(">>> generating: " + fullQualityTypeName);
             try {
                 JavaFileObject jfo = filter.createSourceFile(fullQualityTypeName);
                 Writer writer = jfo.openWriter();
@@ -60,18 +59,22 @@ public class TestableProcessor extends BaseProcessor {
                 MethodSpec.Builder builder = MethodSpec.constructorBuilder()
                     .addModifiers(Modifier.PUBLIC);
                 for (JCTree.JCVariableDecl p : method.getParameters()) {
-                    builder.addParameter(getParameterSpec(p.type));
+                    builder.addParameter(getParameterSpec(p));
                 }
+                CallSuperMethod callSuperMethod = new CallSuperMethod(method).invoke();
+                builder.addStatement(callSuperMethod.getStatement(), callSuperMethod.getParams());
                 methodSpecs.add(builder.build());
             } else {
                 MethodSpec.Builder builder = MethodSpec.methodBuilder(method.name.toString())
                     .addModifiers(method.getModifiers().getFlags())
                     .addModifiers(Modifier.PUBLIC)
-                    .returns(method.restype.getClass());
+                    .returns(TypeName.get(((Type.MethodType)method.sym.type).restype));
                 for (JCTree.JCVariableDecl p : method.getParameters()) {
-                    builder.addParameter(getParameterSpec(p.type));
+                    builder.addParameter(getParameterSpec(p));
                 }
-                builder.addStatement("$T.out.println($S)", System.class, "Hello, Testable !");
+                CallSuperMethod callSuperMethod = new CallSuperMethod(method).invoke();
+                String statement = method.restype == null ? callSuperMethod.getStatement() : "return " + callSuperMethod.getStatement();
+                builder.addStatement(statement, callSuperMethod.getParams());
                 methodSpecs.add(builder.build());
             }
         }
@@ -87,10 +90,8 @@ public class TestableProcessor extends BaseProcessor {
         return javaFile.toString();
     }
 
-    private ParameterSpec getParameterSpec(Type type) {
-        return ParameterSpec.builder(String.class, "placeholder")
-            .addModifiers(Modifier.PUBLIC)
-            .build();
+    private ParameterSpec getParameterSpec(JCTree.JCVariableDecl type) {
+        return ParameterSpec.builder(TypeName.get(type.sym.type), type.name.toString()).build();
     }
 
 }
diff --git a/src/main/java/com/alibaba/testable/util/StringUtil.java b/src/main/java/com/alibaba/testable/util/StringUtil.java
new file mode 100644
index 0000000..7e85382
--- /dev/null
+++ b/src/main/java/com/alibaba/testable/util/StringUtil.java
@@ -0,0 +1,23 @@
+package com.alibaba.testable.util;
+
+import java.util.List;
+
+public class StringUtil {
+
+    static public String join(List<String> list, String conjunction)
+    {
+        StringBuilder sb = new StringBuilder();
+        boolean first = true;
+        for (String item : list)
+        {
+            if (first) {
+                first = false;
+            } else {
+                sb.append(conjunction);
+            }
+            sb.append(item);
+        }
+        return sb.toString();
+    }
+
+}