diff --git a/udf-starter-id/src/main/java/org/itkk/udf/id/IdWorkerFactory.java b/udf-starter-id/src/main/java/org/itkk/udf/id/IdWorkerFactory.java
index d413de4..8ad18b3 100644
--- a/udf-starter-id/src/main/java/org/itkk/udf/id/IdWorkerFactory.java
+++ b/udf-starter-id/src/main/java/org/itkk/udf/id/IdWorkerFactory.java
@@ -330,8 +330,8 @@ public class IdWorkerFactory {
      *
      * @return IdWorkerWrapper
      */
-    private IdWorkerWrapper get() {
-        long dwId = new Date().getTime() & ~(-1L << (IdWorkerConstant.WORKER_ID_BITS + IdWorkerConstant.DATACENTER_ID_BITS));
+    private synchronized IdWorkerWrapper get() {
+        long dwId = System.currentTimeMillis() & ~(-1L << (IdWorkerConstant.WORKER_ID_BITS + IdWorkerConstant.DATACENTER_ID_BITS));
         return this.get(dwId);
     }
 
diff --git a/udf-starter-id/src/main/test/java/org/itkk/udf/id/IdWorkerTest.java b/udf-starter-id/src/main/test/java/org/itkk/udf/id/IdWorkerTest.java
index a0b5fe2..08ad482 100644
--- a/udf-starter-id/src/main/test/java/org/itkk/udf/id/IdWorkerTest.java
+++ b/udf-starter-id/src/main/test/java/org/itkk/udf/id/IdWorkerTest.java
@@ -1,6 +1,7 @@
 package org.itkk.udf.id;
 
 import lombok.extern.slf4j.Slf4j;
+import org.itkk.udf.core.constant.IdWorkerConstant;
 import org.junit.Test;
 
 import java.text.SimpleDateFormat;
@@ -39,6 +40,10 @@ public class IdWorkerTest {
             }
             map.put(id, id);
         }
+        long time = System.currentTimeMillis();
+        log.info(Long.toBinaryString(time));
+        long dwId = time & ~(-1L << (IdWorkerConstant.WORKER_ID_BITS + IdWorkerConstant.DATACENTER_ID_BITS));
+        log.info(Long.toBinaryString(dwId));
         //0 - 0000000000 0000000000 0000000000 0000000000 0 - 00000 - 00000 - 000000000000
         //       1100100 0101110001 1111010110 0111000000 1 - 00001 - 00001 - 000000000000 ---> 1 ,1
         //       1100100 0101110010 0110110000 1110100110 1 - 00010 - 00010 - 000000000000 ---> 2 ,2