diff --git a/src/main/java/com/serliunx/statemanagement/machine/ConcurrentStateMachine.java b/src/main/java/com/serliunx/statemanagement/machine/ConcurrentStateMachine.java
index cc3cfa8..02fa16b 100644
--- a/src/main/java/com/serliunx/statemanagement/machine/ConcurrentStateMachine.java
+++ b/src/main/java/com/serliunx/statemanagement/machine/ConcurrentStateMachine.java
@@ -13,7 +13,7 @@ public interface ConcurrentStateMachine<S> extends StateMachine<S> {
 
     /**
      * 尝试使用CAS更新状态
-     * <li> 无论是否成功更新都不触发状态处理器
+     * <li> 成功更新时触发状态处理器
      *
      * @param expectedValue 前置状态
      * @param newValue      更新的状态值
diff --git a/src/main/java/com/serliunx/statemanagement/machine/DefaultConcurrentStateMachine.java b/src/main/java/com/serliunx/statemanagement/machine/DefaultConcurrentStateMachine.java
index 66bdc8f..ae7d505 100644
--- a/src/main/java/com/serliunx/statemanagement/machine/DefaultConcurrentStateMachine.java
+++ b/src/main/java/com/serliunx/statemanagement/machine/DefaultConcurrentStateMachine.java
@@ -41,7 +41,7 @@ public class DefaultConcurrentStateMachine<S> extends AbstractStateMachine<S> im
 
     @Override
     public boolean compareAndSet(S expectedValue, S newValue) {
-        return compareAndSet(expectedValue, newValue, false);
+        return compareAndSet(expectedValue, newValue, true);
     }
 
     @Override
diff --git a/src/test/java/com/serliunx/statemanagement/MachineTest.java b/src/test/java/com/serliunx/statemanagement/MachineTest.java
index 7256e7c..10c801a 100644
--- a/src/test/java/com/serliunx/statemanagement/MachineTest.java
+++ b/src/test/java/com/serliunx/statemanagement/MachineTest.java
@@ -7,6 +7,9 @@ import com.serliunx.statemanagement.support.PrinterEvent;
 import com.serliunx.statemanagement.support.PrinterState;
 import org.junit.Test;
 
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
 /**
  * 状态机测试
  *
@@ -16,6 +19,8 @@ import org.junit.Test;
  */
 public class MachineTest {
 
+	private final ExecutorService executor = Executors.newFixedThreadPool(5);
+
 	@Test
 	public void testStandardStateMachine() throws Exception {
 		StateMachine<PrinterState> stateMachine = StateMachineBuilder.from(PrinterState.values())
@@ -46,4 +51,22 @@ public class MachineTest {
 		System.out.println(stateMachine.current());
 		stateMachine.close();
 	}
+
+	@Test
+	public void testConcurrentStateMachine2() throws Exception {
+		ConcurrentStateMachine<PrinterState> stateMachine = StateMachineBuilder.from(PrinterState.values())
+				.async(false)
+				.concurrent()
+				.whenEntry(PrinterState.STOPPING, h -> {
+					System.out.println("entering stopping...");
+				})
+				.build();
+
+		for (int i = 0; i < 5; i++) {
+			executor.execute(() -> {
+				System.out.println(stateMachine.compareAndSet(PrinterState.IDLE, PrinterState.STOPPING, true));
+			});
+		}
+
+	}
 }