diff --git a/whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ReentrantLockTest.java b/whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ReentrantLockTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..a95e1028ad142ca8834ad1d5ade1ae303b0b7d1c
--- /dev/null
+++ b/whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ReentrantLockTest.java
@@ -0,0 +1,98 @@
+package org.hongxi.java.util.concurrent;
+
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class ReentrantLockTest {
+
+    public static void main(String[] args) {
+
+        final Business business = new Business();
+        new Thread(() -> {
+            for (int i = 1; i <= 50; i++) {
+                business.sub2(i);
+            }
+        }).start();
+
+        new Thread(() -> {
+            for (int i = 1; i <= 50; i++) {
+                business.sub3(i);
+            }
+        }).start();
+
+        for (int i = 1; i <= 50; i++) {
+            business.main(i);
+        }
+
+    }
+
+    static class Business {
+        Lock lock = new ReentrantLock();
+        Condition condition1 = lock.newCondition();
+        Condition condition2 = lock.newCondition();
+        Condition condition3 = lock.newCondition();
+        private int shouldSub = 1;
+
+        public void sub2(int i) {
+            lock.lock();
+            try {
+                while (shouldSub != 2) {
+                    try {
+                        condition2.await();
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+                }
+                for (int j = 1; j <= 10; j++) {
+                    System.out.println("sub2 thread sequence of " + j + ",loop of " + i);
+                }
+                shouldSub = 3;
+                condition3.signal();
+            } finally {
+                lock.unlock();
+            }
+        }
+
+        public void sub3(int i) {
+            lock.lock();
+            try {
+                while (shouldSub != 3) {
+                    try {
+                        condition3.await();
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+                }
+                for (int j = 1; j <= 20; j++) {
+                    System.out.println("sub3 thread sequence of " + j + ",loop of " + i);
+                }
+                shouldSub = 1;
+                condition1.signal();
+            } finally {
+                lock.unlock();
+            }
+        }
+
+        public void main(int i) {
+            lock.lock();
+            try {
+                while (shouldSub != 1) {
+                    try {
+                        condition1.await();
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+                }
+                for (int j = 1; j <= 100; j++) {
+                    System.out.println("main thread sequence of " + j + ",loop of " + i);
+                }
+                shouldSub = 2;
+                condition2.signal();
+            } finally {
+                lock.unlock();
+            }
+        }
+
+    }
+}