diff --git a/src/main/java/club/joylink/rtss/simulation/cbtc/ATS/service/alarm/NccAlarmService.java b/src/main/java/club/joylink/rtss/simulation/cbtc/ATS/service/alarm/NccAlarmService.java
index 8aa29e19d..ced761ee9 100644
--- a/src/main/java/club/joylink/rtss/simulation/cbtc/ATS/service/alarm/NccAlarmService.java
+++ b/src/main/java/club/joylink/rtss/simulation/cbtc/ATS/service/alarm/NccAlarmService.java
@@ -93,7 +93,7 @@ public class NccAlarmService {
                 repository.addAtsAlarm(atsAlarm);
                 SocketMessageVO<Collection<AtsAlarm>> messageVO =
                         SocketMessageFactory.buildAtsAlarmMessage(simulation.getId(), Collections.singletonList(atsAlarm));
-                stompMessageService.sendToUser(simulation.getCreatorId(), messageVO);
+                stompMessageService.sendToUser(simulation.getSimulationUserIds(), messageVO);
             }
         }
     }