diff --git a/src/main/java/com/alibaba/ttl/threadpool/ExecutorServiceTtlWrapper.java b/src/main/java/com/alibaba/ttl/threadpool/ExecutorServiceTtlWrapper.java
index 476acaf161efef1b2744ada8b03adc762571d6f9..881adb62ed14fefb40c5951c4213218c465cafd1 100644
--- a/src/main/java/com/alibaba/ttl/threadpool/ExecutorServiceTtlWrapper.java
+++ b/src/main/java/com/alibaba/ttl/threadpool/ExecutorServiceTtlWrapper.java
@@ -83,4 +83,9 @@ class ExecutorServiceTtlWrapper extends ExecutorTtlWrapper implements ExecutorSe
     public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
         return executorService.invokeAny(TtlCallable.gets(tasks), timeout, unit);
     }
+
+    @Override
+    public ExecutorService unwrap() {
+        return executorService;
+    }
 }
diff --git a/src/main/java/com/alibaba/ttl/threadpool/ExecutorTtlWrapper.java b/src/main/java/com/alibaba/ttl/threadpool/ExecutorTtlWrapper.java
index 85fe77dd6551800c300ff251867640f9fa321770..d926925c686aec616bc2c8717e5d256e6b197591 100644
--- a/src/main/java/com/alibaba/ttl/threadpool/ExecutorTtlWrapper.java
+++ b/src/main/java/com/alibaba/ttl/threadpool/ExecutorTtlWrapper.java
@@ -24,4 +24,8 @@ class ExecutorTtlWrapper implements Executor {
     public void execute(Runnable command) {
         executor.execute(TtlRunnable.get(command));
     }
+
+    public Executor unwrap() {
+        return executor;
+    }
 }
diff --git a/src/main/java/com/alibaba/ttl/threadpool/ScheduledExecutorServiceTtlWrapper.java b/src/main/java/com/alibaba/ttl/threadpool/ScheduledExecutorServiceTtlWrapper.java
index 547ea819432d7c11d044d42e7a3ec6c867f83d90..6c2641ca74bade7a6d1376f8e7f5ad98a00631a3 100644
--- a/src/main/java/com/alibaba/ttl/threadpool/ScheduledExecutorServiceTtlWrapper.java
+++ b/src/main/java/com/alibaba/ttl/threadpool/ScheduledExecutorServiceTtlWrapper.java
@@ -4,10 +4,7 @@ import com.alibaba.ttl.TransmittableThreadLocal;
 import com.alibaba.ttl.TtlCallable;
 import com.alibaba.ttl.TtlRunnable;
 
-import java.util.concurrent.Callable;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledFuture;
-import java.util.concurrent.TimeUnit;
+import java.util.concurrent.*;
 
 /**
  * {@link TransmittableThreadLocal} Wrapper of {@link ScheduledExecutorService},
@@ -44,4 +41,9 @@ class ScheduledExecutorServiceTtlWrapper extends ExecutorServiceTtlWrapper imple
     public ScheduledFuture<?> scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
         return scheduledExecutorService.scheduleWithFixedDelay(TtlRunnable.get(command), initialDelay, delay, unit);
     }
+
+    @Override
+    public ScheduledExecutorService unwrap() {
+        return scheduledExecutorService;
+    }
 }
diff --git a/src/main/java/com/alibaba/ttl/threadpool/TtlExecutors.java b/src/main/java/com/alibaba/ttl/threadpool/TtlExecutors.java
index 989a1908cba3faf526395d99bc2e57e69a9e3d9e..d82b689c8c27879dbb17cec3d77613903badabc8 100644
--- a/src/main/java/com/alibaba/ttl/threadpool/TtlExecutors.java
+++ b/src/main/java/com/alibaba/ttl/threadpool/TtlExecutors.java
@@ -7,7 +7,7 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.ScheduledExecutorService;
 
 /**
- * Factory Utils for getting TTL Wrapper of jdk executors.
+ * Factory Utils for getting TTL wrapper of jdk executors.
  *
  * @author Jerry Lee (oldratlee at gmail dot com)
  * @see java.util.concurrent.Executor
@@ -56,6 +56,48 @@ public final class TtlExecutors {
         return new ScheduledExecutorServiceTtlWrapper(scheduledExecutorService);
     }
 
+    /**
+     * check the executor is TTL wrapper executor or not.
+     * <p>
+     * if the parameter executor is TTL wrapper, return {@code true}, otherwise {@code false}.
+     * <p>
+     * NOTE: if input executor is {@code null}, return {@code false}.
+     *
+     * @param executor input executor
+     * @param <T>      Executor type
+     * @see #getTtlExecutor(Executor)
+     * @see #getTtlExecutorService(ExecutorService)
+     * @see #getTtlScheduledExecutorService(ScheduledExecutorService)
+     * @see #unwrap(Executor)
+     * @since 2.8.0
+     */
+    public static <T extends Executor> boolean isTtlWrapper(T executor) {
+        return (executor instanceof ExecutorTtlWrapper);
+    }
+
+    /**
+     * Unwrap TTL wrapper executor to the original/underneath one.
+     * <p>
+     * if the parameter executor is TTL wrapper, return the original/underneath executor;
+     * otherwise, just return the input parameter executor.
+     * <p>
+     * NOTE: if input executor is {@code null}, return {@code null}.
+     *
+     * @param executor input executor
+     * @param <T>      Executor type
+     * @see #getTtlExecutor(Executor)
+     * @see #getTtlExecutorService(ExecutorService)
+     * @see #getTtlScheduledExecutorService(ScheduledExecutorService)
+     * @see #isTtlWrapper(Executor)
+     * @since 2.8.0
+     */
+    @SuppressWarnings("unchecked")
+    public static <T extends Executor> T unwrap(T executor) {
+        if (!isTtlWrapper(executor)) return executor;
+
+        return (T) ((ExecutorTtlWrapper) executor).unwrap();
+    }
+
     private TtlExecutors() {
     }
 }
diff --git a/src/main/java/com/alibaba/ttl/threadpool/agent/TtlAgent.java b/src/main/java/com/alibaba/ttl/threadpool/agent/TtlAgent.java
index 18fc4387c77194c4becf1e202665b1c91e29da97..7ce14d812e5b34732f2b15b89b655801c79ca2c5 100644
--- a/src/main/java/com/alibaba/ttl/threadpool/agent/TtlAgent.java
+++ b/src/main/java/com/alibaba/ttl/threadpool/agent/TtlAgent.java
@@ -9,7 +9,10 @@ import com.alibaba.ttl.threadpool.agent.internal.transformlet.impl.TtlTimerTaskT
 
 import java.lang.instrument.ClassFileTransformer;
 import java.lang.instrument.Instrumentation;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 import java.util.logging.Level;
 
 /**
diff --git a/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/JavassistTransformlet.java b/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/JavassistTransformlet.java
index e68f687932546b3eccd46f81e97310304271649f..ae280aabcf951ebebe185eda714473e41126b8b7 100644
--- a/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/JavassistTransformlet.java
+++ b/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/JavassistTransformlet.java
@@ -1,7 +1,6 @@
 package com.alibaba.ttl.threadpool.agent.internal.transformlet;
 
 import javassist.CannotCompileException;
-import javassist.CtClass;
 import javassist.NotFoundException;
 
 import java.io.IOException;
diff --git a/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/TtlForkJoinTransformlet.java b/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/TtlForkJoinTransformlet.java
index f1ee79dccb46222569af242901246c53338336bb..d44ab15d9395fc2cbb829afec2cc1ce74b612aa3 100644
--- a/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/TtlForkJoinTransformlet.java
+++ b/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/TtlForkJoinTransformlet.java
@@ -1,11 +1,11 @@
 package com.alibaba.ttl.threadpool.agent.internal.transformlet.impl;
 
+import com.alibaba.ttl.threadpool.agent.internal.logging.Logger;
 import com.alibaba.ttl.threadpool.agent.internal.transformlet.JavassistTransformlet;
 import javassist.*;
 
 import java.io.IOException;
 import java.lang.reflect.Modifier;
-import com.alibaba.ttl.threadpool.agent.internal.logging.Logger;
 
 import static com.alibaba.ttl.threadpool.agent.internal.transformlet.impl.Utils.getCtClass;
 import static com.alibaba.ttl.threadpool.agent.internal.transformlet.impl.Utils.signatureOfMethod;
diff --git a/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/Utils.java b/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/Utils.java
index d4f0c1ddec30453c3b42496985d440c2db0e62c9..ce4d17502b12d96dcd6cb97833822760e1adbe58 100644
--- a/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/Utils.java
+++ b/src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/Utils.java
@@ -6,8 +6,8 @@ import java.io.ByteArrayInputStream;
 import java.io.IOException;
 
 /**
- * @since 2.6.0
  * @author Jerry Lee (oldratlee at gmail dot com)
+ * @since 2.6.0
  */
 class Utils {
     /**
diff --git a/src/test/java/com/alibaba/demo/agent/AgentDemo.kt b/src/test/java/com/alibaba/demo/agent/AgentDemo.kt
index 46bb180d1647cfa9b0e027beaca0004fa2e20597..809f473e53099abda474dc8bdaa9c158ac6817dc 100644
--- a/src/test/java/com/alibaba/demo/agent/AgentDemo.kt
+++ b/src/test/java/com/alibaba/demo/agent/AgentDemo.kt
@@ -3,7 +3,6 @@
 package com.alibaba.demo.agent
 
 import com.alibaba.ttl.TransmittableThreadLocal
-import java.lang.IllegalStateException
 import java.util.concurrent.ExecutorService
 import java.util.concurrent.Executors
 import java.util.concurrent.TimeUnit
diff --git a/src/test/java/com/alibaba/demo/distributed_tracer/refcount/DistributedTracerUseDemo.kt b/src/test/java/com/alibaba/demo/distributed_tracer/refcount/DistributedTracerUseDemo.kt
index a3443bbcf4aca60ac47c7de4bffd111c23c41d08..c57662a1eb67c852d1e809057222f5f7398fb7d1 100644
--- a/src/test/java/com/alibaba/demo/distributed_tracer/refcount/DistributedTracerUseDemo.kt
+++ b/src/test/java/com/alibaba/demo/distributed_tracer/refcount/DistributedTracerUseDemo.kt
@@ -2,11 +2,11 @@ package com.alibaba.demo.distributed_tracer.refcount
 
 import com.alibaba.ttl.TransmittableThreadLocal
 import com.alibaba.ttl.threadpool.TtlExecutors
+import java.lang.Thread.sleep
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.Executors
 import java.util.concurrent.atomic.AtomicInteger
 import kotlin.concurrent.thread
-import java.lang.Thread.sleep
 
 /**
  * DistributedTracer(DT) use demo.
diff --git a/src/test/java/com/alibaba/demo/timer/TimerTaskDemo.kt b/src/test/java/com/alibaba/demo/timer/TimerTaskDemo.kt
index aa5a8cccc345a7cc6c57796f78e6ad44af8908cd..13e4e2be2e889b2458a77e317025a784b04e95ed 100644
--- a/src/test/java/com/alibaba/demo/timer/TimerTaskDemo.kt
+++ b/src/test/java/com/alibaba/demo/timer/TimerTaskDemo.kt
@@ -1,9 +1,7 @@
 package com.alibaba.demo.timer
 
 import java.text.SimpleDateFormat
-import java.util.Date
-import java.util.Timer
-import java.util.TimerTask
+import java.util.*
 
 /**
  * @see [Java Timer TimerTask Example](https://www.journaldev.com/1050/java-timer-timertask-example)
diff --git a/src/test/java/com/alibaba/ttl/threadpool/TtlExecutorsTest.kt b/src/test/java/com/alibaba/ttl/threadpool/TtlExecutorsTest.kt
index 85fd2043352506518431fa0e58deaa3ab0c69c98..268563b4f2febdfb8acc438b89d45f480cc354c7 100644
--- a/src/test/java/com/alibaba/ttl/threadpool/TtlExecutorsTest.kt
+++ b/src/test/java/com/alibaba/ttl/threadpool/TtlExecutorsTest.kt
@@ -1,16 +1,45 @@
 package com.alibaba.ttl.threadpool
 
-import org.junit.Assert.assertNull
+import com.alibaba.ttl.threadpool.TtlExecutors.*
+import org.junit.Assert.*
 import org.junit.Test
+import java.util.concurrent.Executors.newScheduledThreadPool
 
 /**
  * @author Jerry Lee (oldratlee at gmail dot com)
  */
 class TtlExecutorsTest {
+    @Test
+    fun test_common() {
+        val newScheduledThreadPool = newScheduledThreadPool(3)
+
+        getTtlExecutor(newScheduledThreadPool).let {
+            assertTrue(it is ExecutorTtlWrapper)
+            assertTrue(isTtlWrapper(it))
+
+            assertSame(newScheduledThreadPool, unwrap(it))
+        }
+        getTtlExecutorService(newScheduledThreadPool).let {
+            assertTrue(it is ExecutorServiceTtlWrapper)
+            assertTrue(isTtlWrapper(it))
+
+            assertSame(newScheduledThreadPool, unwrap(it))
+        }
+        getTtlScheduledExecutorService(newScheduledThreadPool).let {
+            assertTrue(it is ScheduledExecutorServiceTtlWrapper)
+            assertTrue(isTtlWrapper(it))
+
+            assertSame(newScheduledThreadPool, unwrap(it))
+        }
+    }
+
     @Test
     fun test_null() {
         assertNull(TtlExecutors.getTtlExecutor(null))
         assertNull(TtlExecutors.getTtlExecutorService(null))
-        assertNull(TtlExecutors.getTtlScheduledExecutorService(null))
+        assertNull(getTtlScheduledExecutorService(null))
+
+        assertFalse(isTtlWrapper(null))
+        assertNull(unwrap(null))
     }
 }
diff --git a/src/test/java/com/alibaba/ttl/threadpool/agent/TtlAgentTest.kt b/src/test/java/com/alibaba/ttl/threadpool/agent/TtlAgentTest.kt
index add88326b069a8caf6a9faa57db49e5ba41984ee..e661eb6e2f4a9d4f5fbf99986f49227119b27296 100644
--- a/src/test/java/com/alibaba/ttl/threadpool/agent/TtlAgentTest.kt
+++ b/src/test/java/com/alibaba/ttl/threadpool/agent/TtlAgentTest.kt
@@ -1,10 +1,9 @@
 package com.alibaba.ttl.threadpool.agent
 
 import com.alibaba.ttl.threadpool.agent.TtlAgent.splitCommaColonStringToKV
+import org.junit.Assert.assertEquals
 import org.junit.Test
 
-import org.junit.Assert.*
-
 class TtlAgentTest {
     @Test
     fun test_splitCommaColonStringToKV() {