diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/sal/LocalDeviceServiceImpl.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/sal/LocalDeviceServiceImpl.java
index c7eacb8d..06e955df 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/sal/LocalDeviceServiceImpl.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/sal/LocalDeviceServiceImpl.java
@@ -14,9 +14,13 @@ import java.util.concurrent.TimeUnit;
  */
 @Component(value = "local")
 public class LocalDeviceServiceImpl implements DeviceService {
+    /*static RemovalListener<String, Device> removalListener = new RemovalListener<String, Device>() {
+        public void onRemoval(RemovalNotification<String, Device> removal) {
 
+        }
+    };*/
     private static final Cache<String, Device> deviceCache = CacheBuilder.newBuilder().
-            expireAfterWrite(30, TimeUnit.MINUTES).build();
+            expireAfterWrite(90, TimeUnit.MINUTES).build();
 
     private static final Cache<String, List<Device>> subDeviceCache = CacheBuilder.newBuilder().
             expireAfterWrite(10, TimeUnit.MINUTES).build();
@@ -49,9 +53,12 @@ public class LocalDeviceServiceImpl implements DeviceService {
     }
 
     public void refresh(String deviceId){
-        Device device = delegate.findByDeviceId(deviceId);
+        Device device = deviceCache.getIfPresent(deviceId);
         if (device != null) {
-            deviceCache.put(deviceId, device);
+            if(device.getParentId()!=null) {
+                subDeviceCache.invalidate(device.getParentId());
+            }
+            deviceCache.invalidate(deviceId);
         }
     }
 }