diff --git a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ExecutorServiceImpl.java b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ExecutorServiceImpl.java
index 765c5c7a38..5a31c8efdd 100644
--- a/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ExecutorServiceImpl.java
+++ b/dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ExecutorServiceImpl.java
@@ -1274,9 +1274,8 @@ public class ExecutorServiceImpl extends BaseServiceImpl implements ExecutorServ
      */
     private String removeDuplicates(String scheduleTimeList) {
         if (StringUtils.isNotEmpty(scheduleTimeList)) {
-            Set<String> dateSet =
-                    Arrays.stream(scheduleTimeList.split(COMMA)).map(String::trim).collect(Collectors.toSet());
-            return String.join(COMMA, dateSet);
+            return Arrays.stream(scheduleTimeList.split(COMMA)).map(String::trim).distinct()
+                    .collect(Collectors.joining(COMMA));
         }
         return null;
     }