diff --git a/README.md b/README.md
index af25cd0..f71f99f 100644
--- a/README.md
+++ b/README.md
@@ -30,8 +30,32 @@
 ### 配置日志输出级别
 修改 `simplelogger.properties` 文件中的内容。配置日志输出级别，一般使用 `debug`、`info`
 
-debug 级别下运行将会非常友好的输出 JVM 正在执行的栈信息
-![](/readme/20230721180520.png)
+debug 级别下运行将会非常友好的输出 JVM 正在执行的栈信息   
+例如使用 haidnorJVM 执行以下代码
+```java
+public class Demo5 {
+
+    public static void main(String[] args) {
+        String str = method1("hello world");
+        method1(str);
+    }
+
+    public static String method1(String s) {
+        return method2(s);
+    }
+
+    public static String method2(String s) {
+        return method3(s);
+    }
+
+    public static String method3(String s) {
+        System.out.println(s);
+        return "你好 世界";
+    }
+    
+}
+```
+![](/readme/20230721203048.png)
 
 info 级别将不会看到任何 haidnorJVM 内部运行信息
 
diff --git a/readme/20230721180520.png b/readme/20230721180520.png
deleted file mode 100644
index 926a0a4..0000000
Binary files a/readme/20230721180520.png and /dev/null differ
diff --git a/readme/20230721203048.png b/readme/20230721203048.png
new file mode 100644
index 0000000..4168abe
Binary files /dev/null and b/readme/20230721203048.png differ
diff --git a/src/test/java/haidnor/jvm/test/TestJVM.java b/src/test/java/haidnor/jvm/test/TestJVM.java
index 1aa577f..9ed3822 100644
--- a/src/test/java/haidnor/jvm/test/TestJVM.java
+++ b/src/test/java/haidnor/jvm/test/TestJVM.java
@@ -6,10 +6,7 @@ import haidnor.jvm.rtda.heap.Klass;
 import haidnor.jvm.rtda.heap.KlassMethod;
 import haidnor.jvm.rtda.metaspace.Metaspace;
 import haidnor.jvm.runtime.JvmThread;
-import haidnor.jvm.test.demo.Demo1;
-import haidnor.jvm.test.demo.Demo2;
-import haidnor.jvm.test.demo.Demo3;
-import haidnor.jvm.test.demo.Demo4;
+import haidnor.jvm.test.demo.*;
 import haidnor.jvm.test.instruction.Array;
 import haidnor.jvm.test.instruction.DO_WHILE;
 import haidnor.jvm.test.instruction.math.ISUB;
@@ -57,6 +54,11 @@ public class TestJVM {
         runMainClass(Demo4.class);
     }
 
+    @Test
+    public void test_5() throws Exception {
+        runMainClass(Demo5.class);
+    }
+
     @Test
     public void test_NEW() throws Exception {
         runMainClass(NEW.class);
diff --git a/src/test/java/haidnor/jvm/test/demo/Demo5.java b/src/test/java/haidnor/jvm/test/demo/Demo5.java
new file mode 100644
index 0000000..39649e3
--- /dev/null
+++ b/src/test/java/haidnor/jvm/test/demo/Demo5.java
@@ -0,0 +1,23 @@
+package haidnor.jvm.test.demo;
+
+public class Demo5 {
+
+    public static void main(String[] args) {
+        String str = method1("hello world");
+        method1(str);
+    }
+
+    public static String method1(String s) {
+        return method2(s);
+    }
+
+    public static String method2(String s) {
+        return method3(s);
+    }
+
+    public static String method3(String s) {
+        System.out.println(s);
+        return "你好 世界";
+    }
+
+}