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 8f158e29..b30ca19b 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
@@ -42,7 +42,8 @@ public interface DeviceMapper {
             "asMessageChannel," +
             "geoCoordSys," +
             "treeType," +
-            "online" +
+            "online," +
+            "(SELECT count(0) FROM device_channel WHERE deviceId=device.deviceId) as channelCount "+
             " FROM device WHERE deviceId = #{deviceId}")
     Device getDeviceByDeviceId(String deviceId);