diff --git a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoInherit.kt b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoInherit.kt
index d813582..2bb0c48 100644
--- a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoInherit.kt
+++ b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoInherit.kt
@@ -4,6 +4,10 @@ import com.alibaba.testable.demo.model.BlackBox
 import com.alibaba.testable.demo.model.Box
 import com.alibaba.testable.demo.model.Color
 
+/**
+ * 演示父类变量引用子类对象时的Mock场景
+ * Demonstrate scenario of mocking method from sub-type object referred by parent-type variable
+ */
 class DemoInherit {
 
     /**
diff --git a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoMatcher.kt b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoMatcher.kt
index bf35841..9827666 100644
--- a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoMatcher.kt
+++ b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoMatcher.kt
@@ -4,7 +4,8 @@ import com.alibaba.testable.demo.model.BlackBox
 import java.util.*
 
 /**
- * @author flin
+ * 演示Mock方法调用校验器
+ * Demonstrate mock method invocation verifier
  */
 class DemoMatcher {
     /**
diff --git a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoMock.kt b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoMock.kt
index 5adbc00..7e896a6 100644
--- a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoMock.kt
+++ b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoMock.kt
@@ -5,6 +5,10 @@ import com.alibaba.testable.demo.model.ColorBox
 import java.nio.file.Files
 import java.nio.file.Paths
 
+/**
+ * 演示基本的Mock功能
+ * Demonstrate basic mock functionality
+ */
 class DemoMock {
 
     /**
@@ -18,7 +22,7 @@ class DemoMock {
      * method with member method invoke
      */
     fun outerFunc(s: String): String {
-        return "{ \"res\": \"" + innerFunc(s) + "\"}"
+        return "{ \"res\": \"" + innerFunc(s) + staticFunc() + "\"}"
     }
 
     /**
@@ -52,4 +56,10 @@ class DemoMock {
     }
 
     private fun callFromDifferentMethod() = "realOne"
+
+    companion object {
+        private fun staticFunc(): String {
+            return "_STATIC_TAIL"
+        }
+    }
 }
diff --git a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoPrivateAccess.kt b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoPrivateAccess.kt
index adfe0d5..e1c3587 100644
--- a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoPrivateAccess.kt
+++ b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoPrivateAccess.kt
@@ -1,5 +1,9 @@
 package com.alibaba.testable.demo
 
+/**
+ * 演示私有成员访问功能
+ * Demonstrate private member access functionality
+ */
 class DemoPrivateAccess {
 
     /**
@@ -15,8 +19,8 @@ class DemoPrivateAccess {
     /**
      * private member method
      */
-    private fun privateFunc(s: String, i: Int): String {
-        return "$s - $i"
+    private fun privateFunc(list: List<String>, str: String, i: Int): String {
+        return list.reduce { a: String, s: String -> a + s } + " + " + "$str + $i"
     }
 
     companion object {
@@ -29,15 +33,15 @@ class DemoPrivateAccess {
         /**
          * private static method
          */
-        private fun privateStaticFunc(s: String, i: Int): String {
-            return "$s + $i"
+        private fun privateStaticFunc(str: String, i: Int): String {
+            return "$str + $i"
         }
 
         /**
          * private jvm static method
          */
-        @JvmStatic private fun privateJvmStaticFunc(s: String, i: Int): String {
-            return "$s * $i"
+        @JvmStatic private fun privateJvmStaticFunc(list: List<String>, str: String, i: Int): String {
+            return list.reduce { a: String, s: String -> a + s } + " * " + "$str * $i"
         }
     }
 
diff --git a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoTemplate.kt b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoTemplate.kt
index 74458ba..6f15ba2 100644
--- a/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoTemplate.kt
+++ b/demo/kotlin-demo/src/main/kotlin/com/alibaba/testable/demo/DemoTemplate.kt
@@ -4,6 +4,10 @@ import java.util.ArrayList
 import java.util.HashMap
 import java.util.HashSet
 
+/**
+ * 演示模板方法的Mock场景
+ * Demonstrate scenario of mocking template method
+ */
 class DemoTemplate {
     private fun <T> getList(value: T): List<T> {
         val l: MutableList<T> = ArrayList()
diff --git a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoMockTest.kt b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoMockTest.kt
index 12a77bb..ba2be22 100644
--- a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoMockTest.kt
+++ b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoMockTest.kt
@@ -25,6 +25,11 @@ internal class DemoMockTest {
     @MockMethod
     private fun innerFunc(self: DemoMock, text: String) = "mock_$text"
 
+    @MockMethod
+    private fun staticFunc(self: DemoMock): String {
+        return "_MOCK_TAIL";
+    }
+
     @MockMethod
     private fun trim(self: BlackBox) = "trim_string"
 
@@ -65,7 +70,7 @@ internal class DemoMockTest {
 
     @Test
     fun should_able_to_mock_member_method() {
-        assertEquals("{ \"res\": \"mock_hello\"}", demoMock.outerFunc("hello"))
+        assertEquals("{ \"res\": \"mock_hello_MOCK_TAIL\"}", demoMock.outerFunc("hello"))
         verify("innerFunc").with("hello")
     }
 
diff --git a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoPrivateAccessTest.kt b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoPrivateAccessTest.kt
index 438c687..52c5b90 100644
--- a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoPrivateAccessTest.kt
+++ b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoPrivateAccessTest.kt
@@ -14,7 +14,8 @@ internal class DemoPrivateAccessTest {
 
     @Test
     fun should_able_to_access_private_method() {
-        assertEquals("hello - 1", PrivateAccessor.invoke(demoPrivateAccess, "privateFunc", "hello", 1))
+        val list = listOf("a", "b", "c");
+        assertEquals("abc + hello + 1", PrivateAccessor.invoke(demoPrivateAccess, "privateFunc", list, "hello", 1))
     }
 
     @Test
@@ -25,8 +26,9 @@ internal class DemoPrivateAccessTest {
 
     @Test
     fun should_able_to_access_private_static_method() {
+        val list = listOf("a", "b", "c");
         assertEquals("hello + 1", PrivateAccessor.invokeStatic(DemoPrivateAccess::class.java, "privateStaticFunc", "hello", 1))
-        assertEquals("hello * 1", PrivateAccessor.invokeStatic(DemoPrivateAccess::class.java, "privateJvmStaticFunc", "hello", 1))
+        assertEquals("abc * hello * 1", PrivateAccessor.invokeStatic(DemoPrivateAccess::class.java, "privateJvmStaticFunc", list, "hello", 1))
     }
 
     @Test
diff --git a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoTemplateTest.kt b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoTemplateTest.kt
index 880ea37..608a0c3 100644
--- a/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoTemplateTest.kt
+++ b/demo/kotlin-demo/src/test/kotlin/com/alibaba/testable/demo/DemoTemplateTest.kt
@@ -7,8 +7,8 @@ import org.junit.jupiter.api.Test
 import java.util.*
 
 /**
- * 演示模板方法可以被Mock
- * Demonstrate template method can be mocked
+ * 演示模板方法的Mock场景
+ * Demonstrate scenario of mocking template method
  */
 internal class DemoTemplateTest {