diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/AbstractClassEnhancePluginDefine.java b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/AbstractClassEnhancePluginDefine.java
index 7215fa1bf..9c3a9b5dc 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/AbstractClassEnhancePluginDefine.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/AbstractClassEnhancePluginDefine.java
@@ -125,6 +125,7 @@ public abstract class AbstractClassEnhancePluginDefine {
      */
     protected DynamicType.Builder<?> enhance(TypeDescription typeDescription, DynamicType.Builder<?> newClassBuilder,
                                              ClassLoader classLoader, EnhanceContext context) throws PluginException {
+        // 增强静态方法
         newClassBuilder = this.enhanceClass(typeDescription, newClassBuilder, classLoader);
 
         newClassBuilder = this.enhanceInstance(typeDescription, newClassBuilder, classLoader, context);
diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/ClassEnhancePluginDefine.java b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/ClassEnhancePluginDefine.java
index ec6628fe9..edf87b52f 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/ClassEnhancePluginDefine.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/ClassEnhancePluginDefine.java
@@ -114,6 +114,7 @@ public abstract class ClassEnhancePluginDefine extends AbstractClassEnhancePlugi
         /**
          * 2. enhance constructors
          */
+        //构造器增强
         if (existedConstructorInterceptPoint) {
             for (ConstructorInterceptPoint constructorInterceptPoint : constructorInterceptPoints) {
                 String constructorInterceptor = constructorInterceptPoint.getConstructorInterceptor();
@@ -157,6 +158,7 @@ public abstract class ClassEnhancePluginDefine extends AbstractClassEnhancePlugi
                         newClassBuilder = newClassBuilder.method(junction)
                                                          .intercept(MethodDelegation.withDefaultConfiguration()
                                                                                     .withBinders(Morph.Binder.install(OverrideCallable.class))
+                                                                 // 进行方法增强的核心MethodDelegation.to()将目标方法执行委托给拦截器
                                                                                     .to(new InstMethodsInterWithOverrideArgs(getPluginName(), interceptor, classLoader), delegateNamingResolver.resolve(instanceMethodsInterceptPoint)));
                     }
                 } else {
diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/InstMethodsInterWithOverrideArgs.java b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/InstMethodsInterWithOverrideArgs.java
index fabe5094e..3dc989953 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/InstMethodsInterWithOverrideArgs.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/InstMethodsInterWithOverrideArgs.java
@@ -70,6 +70,7 @@ public class InstMethodsInterWithOverrideArgs {
      * @throws Exception only throw exception because of zuper.call() or unexpected exception in sky-walking ( This is a
      *                   bug, if anything triggers this condition ).
      */
+    // 通过@RuntimeType注解,能够动态匹配目标类的所有方法,从而进行拦截
     @RuntimeType
     public Object intercept(@This Object obj, @AllArguments Object[] allArguments, @Origin Method method,
         @Morph OverrideCallable zuper) throws Throwable {
diff --git a/apm-sniffer/apm-agent/src/main/java/org/apache/skywalking/apm/agent/SkyWalkingAgent.java b/apm-sniffer/apm-agent/src/main/java/org/apache/skywalking/apm/agent/SkyWalkingAgent.java
index d873ba8e0..8f20cd75f 100644
--- a/apm-sniffer/apm-agent/src/main/java/org/apache/skywalking/apm/agent/SkyWalkingAgent.java
+++ b/apm-sniffer/apm-agent/src/main/java/org/apache/skywalking/apm/agent/SkyWalkingAgent.java
@@ -111,6 +111,7 @@ public class SkyWalkingAgent {
         }
 
         try {
+            // 3.启动上报等核心服务
             ServiceManager.INSTANCE.boot();
         } catch (Exception e) {
             LOGGER.error(e, "Skywalking agent boot failure.");
@@ -150,6 +151,7 @@ public class SkyWalkingAgent {
         }
 
         agentBuilder.type(pluginFinder.buildMatch())
+                    // 注入增强字节码
                     .transform(new Transformer(pluginFinder))
                     .with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION)
                     .with(new RedefinitionListener())