diff --git a/demo-athenaopt_backend/develop/src/main/java/com/digiwin/athena/app/ptc/service/production/ProductionCreateEAIService.java b/demo-athenaopt_backend/develop/src/main/java/com/digiwin/athena/app/ptc/service/production/ProductionCreateEAIService.java
index a1097de..8dbd85c 100644
--- a/demo-athenaopt_backend/develop/src/main/java/com/digiwin/athena/app/ptc/service/production/ProductionCreateEAIService.java
+++ b/demo-athenaopt_backend/develop/src/main/java/com/digiwin/athena/app/ptc/service/production/ProductionCreateEAIService.java
@@ -99,7 +99,7 @@ public class ProductionCreateEAIService extends AbsEAIService {
     }
 
     private String cteateBatchNo(){
-        StringBuilder sb = new StringBuilder();
+        StringBuffer sb = new StringBuffer();
         Long batchNo;
         if (redisUtil.getRedisTemplate().hasKey(ProductionUtil.KEY)) {
             batchNo = redisUtil.incrBy(ProductionUtil.KEY, 1);