diff --git a/example/mqtt-car/src/main/java/org/dromara/mica/mqtt/server/task/PlatePublishTask.java b/example/mqtt-car/src/main/java/org/dromara/mica/mqtt/server/task/PlatePublishTask.java
index eccfab4..1fc4235 100644
--- a/example/mqtt-car/src/main/java/org/dromara/mica/mqtt/server/task/PlatePublishTask.java
+++ b/example/mqtt-car/src/main/java/org/dromara/mica/mqtt/server/task/PlatePublishTask.java
@@ -117,10 +117,12 @@ public class PlatePublishTask {
 				for (CarInfo car : carInfos) {
 					plates.add(car.getPlate());
 
-					CarParkRecord carParkRecord = new CarParkRecord();
-					carParkRecord.setClientId(uuid);
-					carParkRecord.setId(car.getCarParkRecordId());
-					carParkRecords.add(carParkRecord);
+					if (StrUtil.equals(car.getSn(), sn)) {
+						CarParkRecord carParkRecord = new CarParkRecord();
+						carParkRecord.setClientId(uuid);
+						carParkRecord.setId(car.getCarParkRecordId());
+						carParkRecords.add(carParkRecord);
+					}
 				}
 				po.setPayload(buildPayloadDel(plates));