diff --git a/src/main/java/org/springblade/modules/job/CarInfoTask.java b/src/main/java/org/springblade/modules/job/CarInfoTask.java
index 58610d9..66702e5 100644
--- a/src/main/java/org/springblade/modules/job/CarInfoTask.java
+++ b/src/main/java/org/springblade/modules/job/CarInfoTask.java
@@ -49,6 +49,8 @@ public class CarInfoTask {
     private static final String WEB = "web";
     private static final String CURRENT_CAR_INFO = "current_car_info";
     private static final String SPEED = "speed";
+    private static final String ONLINE = "online";
+    private static final String OFFLINE = "offline";
 
     private final ICarInfoService carInfoService;
 
@@ -83,7 +85,7 @@ public class CarInfoTask {
         String carNo = CarInfoCache.getPushCarNo();
         HashMap<String, Object> statusMap = new HashMap<>();
         if (Func.isEmpty(carNo)) {
-            statusMap.put("status","offline");
+            statusMap.put("status",OFFLINE);
             message.setContent(JSON.toJSONString(statusMap));
             websocketService.broadcast(message);
             return;
@@ -97,7 +99,7 @@ public class CarInfoTask {
             }
         }
         if (Func.isEmpty(info)) {
-            statusMap.put("status","offline");
+            statusMap.put("status",OFFLINE);
             message.setContent(JSON.toJSONString(statusMap));
             websocketService.broadcast(message);
             return;
@@ -240,7 +242,7 @@ public class CarInfoTask {
         WebSocketMessage message = new WebSocketMessage();
         HashMap<String, Object> statusMap = new HashMap<>();
         if (Func.isEmpty(info)) {
-            statusMap.put("status","offline");
+            statusMap.put("status",OFFLINE);
             message.setContent(JSON.toJSONString(statusMap));
             websocketService.broadcast(message);
             return;