diff --git a/apps/iot/src/iot_device.erl b/apps/iot/src/iot_device.erl
index 6f766ea..57bd8a9 100644
--- a/apps/iot/src/iot_device.erl
+++ b/apps/iot/src/iot_device.erl
@@ -179,6 +179,9 @@ code_change(_OldVsn, StateName, State = #state{}, _Extra) ->
 %%%===================================================================
 
 -spec report_event(DeviceUUID :: binary(), NewStatus :: integer()) -> no_return().
+report_event(DeviceUUID, ?DEVICE_UNKNOWN) ->
+    lager:notice("[iot_device] device_uuid: ~p, status: unknown, not report", [DeviceUUID]),
+    ok;
 report_event(DeviceUUID, NewStatus) when is_binary(DeviceUUID), is_integer(NewStatus) ->
     %% 设备的状态信息上报给中电
     Timestamp = iot_util:timestamp_of_seconds(),
diff --git a/docs/north_data.md b/docs/north_data.md
index c03e9fc..cf848ff 100644
--- a/docs/north_data.md
+++ b/docs/north_data.md
@@ -53,7 +53,7 @@
 
 {
     "key": "device_status",
-    "value": NewStatus, 0: 离线， 1: 在线, 2: 未知
+    "value": NewStatus, 0: 离线， 1: 在线
     "unit": 0,
     "type": <<"DI">>,
     "name": "设备状态",