diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/id/TimeBasedIdGenerator.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/id/TimeBasedIdGenerator.java
index 959f2866d..ec4aee6a0 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/id/TimeBasedIdGenerator.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/id/TimeBasedIdGenerator.java
@@ -17,20 +17,19 @@ public class TimeBasedIdGenerator implements IdGenerator {
 
     private static final long SEQUENCE_BITS = 9L;
     private static final long MAX_SEQUENCE = ~(-1L << SEQUENCE_BITS);
-
-    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmm");
     private static final AtomicLong sequence = new AtomicLong(0);
     private static volatile String lastTimestamp = "";
 
     @Override
     public synchronized String getNextId() {
+        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmm");
         String timestamp = dateFormat.format(new Date());
 
         if (timestamp.equals(lastTimestamp)) {
             long currentSequence = sequence.incrementAndGet() & MAX_SEQUENCE;
             if (currentSequence == 0) {
                 // 如果递增数已达到最大值，则等待下一毫秒
-                timestamp = tilNextTimestamp(timestamp);
+                timestamp = tilNextTimestamp(timestamp, dateFormat);
             }
         } else {
             sequence.set(0);
@@ -41,7 +40,7 @@ public class TimeBasedIdGenerator implements IdGenerator {
         return timestamp + String.format("%09d", sequence.get());
     }
 
-    private String tilNextTimestamp(String lastTimestamp) {
+    private String tilNextTimestamp(String lastTimestamp, SimpleDateFormat dateFormat) {
         String timestamp = dateFormat.format(new Date());
         while (timestamp.equals(lastTimestamp)) {
             timestamp = dateFormat.format(new Date());