diff --git a/src/main/java/com/genersoft/iot/vmp/storager/dao/DeviceMapper.java b/src/main/java/com/genersoft/iot/vmp/storager/dao/DeviceMapper.java
index 97cf2ccfc..7fa017a33 100644
--- a/src/main/java/com/genersoft/iot/vmp/storager/dao/DeviceMapper.java
+++ b/src/main/java/com/genersoft/iot/vmp/storager/dao/DeviceMapper.java
@@ -13,7 +13,7 @@ import java.util.List;
 @Repository
 public interface DeviceMapper {
 
-    @Select("SELECT * FROM device WHERE deviceId = #{deviceId}")
+    @Select("SELECT *, (SELECT count(0) FROM device_channel WHERE deviceId=device.deviceId) as channelCount FROM device WHERE deviceId = #{deviceId}")
     Device getDeviceByDeviceId(String deviceId);
 
     @Insert("INSERT INTO device (" +