diff --git a/checkstyle/hippo4j_checkstyle_suppression.xml b/checkstyle/hippo4j_checkstyle_suppression.xml
index 6d6baded..1a328a45 100644
--- a/checkstyle/hippo4j_checkstyle_suppression.xml
+++ b/checkstyle/hippo4j_checkstyle_suppression.xml
@@ -32,4 +32,5 @@
     <suppress checks="TypeName" files="SpringBootConfig.java"/>
     <suppress checks="ReturnCount" files="Hippo4jAgent.java"/>
     <suppress checks="StaticVariableName" files="Hippo4jAgent.java"/>
+    <suppress checks="StaticVariableName" files="ExtensionRegistry.java"/>
 </suppressions>
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/extension/annotation/Realization.java b/threadpool/core/src/main/java/cn/hippo4j/core/extension/annotation/Realization.java
index b67a58ca..90c35e60 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/extension/annotation/Realization.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/extension/annotation/Realization.java
@@ -25,6 +25,9 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+/**
+ * realization
+ */
 @Inherited
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ElementType.TYPE})
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/None.java b/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/None.java
index db2c1fcc..9c4ea642 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/None.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/None.java
@@ -22,6 +22,10 @@ import cn.hippo4j.core.extension.support.ReduceType;
 import java.util.List;
 import java.util.stream.Collectors;
 
+/**
+ * None extends
+ * @param <Element>
+ */
 public class None<Element> extends Reducer<Element, List<Element>> {
 
     @Override
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/Reducer.java b/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/Reducer.java
index 1fc2c2d3..111cb195 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/Reducer.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/Reducer.java
@@ -26,6 +26,11 @@ import lombok.Setter;
 
 import java.util.List;
 
+/**
+ * reducer
+ * @param <Element>
+ * @param <Result>
+ */
 public abstract class Reducer<Element, Result> {
 
     @Getter
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/Reducers.java b/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/Reducers.java
index f2937205..83be76ec 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/Reducers.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/extension/reducer/Reducers.java
@@ -23,6 +23,9 @@ import java.util.List;
 import java.util.Objects;
 import java.util.function.Predicate;
 
+/**
+ * reducers
+ */
 @SuppressWarnings("all")
 public class Reducers {
 
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ExtensionAutoConfiguration.java b/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ExtensionAutoConfiguration.java
index 67975b85..ea924ace 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ExtensionAutoConfiguration.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ExtensionAutoConfiguration.java
@@ -21,6 +21,9 @@ import cn.hippo4j.core.extension.config.ExtensionRegisterBootstrap;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
+/**
+ * extension auto  configuration
+ */
 @Configuration
 public class ExtensionAutoConfiguration {
 
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ExtensionRegistry.java b/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ExtensionRegistry.java
index 33178c5a..c2406bde 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ExtensionRegistry.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ExtensionRegistry.java
@@ -34,7 +34,7 @@ import java.util.concurrent.ConcurrentHashMap;
  * Extension registry
  */
 @Slf4j
-public class ExtensionRegistry implements IExtensionRegistry {
+public final class ExtensionRegistry implements IExtensionRegistry {
 
     private final Map<Class<? extends IExtension>, List<IExtension>> registry = new ConcurrentHashMap<>();
 
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/IExtensionRegistry.java b/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/IExtensionRegistry.java
index 9f3b5ae9..44a1e479 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/IExtensionRegistry.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/IExtensionRegistry.java
@@ -21,6 +21,9 @@ import cn.hippo4j.core.extension.IExtension;
 
 import java.util.List;
 
+/**
+ * extension registry interface
+ */
 public interface IExtensionRegistry {
 
     void register(IExtension realization);
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ReduceType.java b/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ReduceType.java
index f2ab125e..48bd65a7 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ReduceType.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/extension/support/ReduceType.java
@@ -17,6 +17,9 @@
 
 package cn.hippo4j.core.extension.support;
 
+/**
+ * reduce type
+ */
 public enum ReduceType {
 
     NONE,
diff --git a/threadpool/core/src/main/java/cn/hippo4j/core/handler/DynamicThreadPoolBannerHandler.java b/threadpool/core/src/main/java/cn/hippo4j/core/handler/DynamicThreadPoolBannerHandler.java
index 521a3e47..9ae456d1 100644
--- a/threadpool/core/src/main/java/cn/hippo4j/core/handler/DynamicThreadPoolBannerHandler.java
+++ b/threadpool/core/src/main/java/cn/hippo4j/core/handler/DynamicThreadPoolBannerHandler.java
@@ -70,7 +70,7 @@ public class DynamicThreadPoolBannerHandler implements InitializingBean {
             while (padding.length() < STRAP_LINE_SIZE - (bannerVersion.length() + DYNAMIC_THREAD_POOL.length())) {
                 padding.append(" ");
             }
-            System.out.println(AnsiOutput.toString(banner, AnsiColor.GREEN, DYNAMIC_THREAD_POOL, AnsiColor.DEFAULT,
+            log.info(AnsiOutput.toString(banner, AnsiColor.GREEN, DYNAMIC_THREAD_POOL, AnsiColor.DEFAULT,
                     padding.toString(), AnsiStyle.FAINT, bannerVersion, "\n\n", HIPPO4J_GITHUB, "\n", HIPPO4J_SITE, "\n"));
 
         }