diff --git a/apps/iot/src/database/device_bo.erl b/apps/iot/src/database/device_bo.erl
index c41e705..eab0e5f 100644
--- a/apps/iot/src/database/device_bo.erl
+++ b/apps/iot/src/database/device_bo.erl
@@ -17,9 +17,14 @@
 get_all_devices() ->
     mysql_pool:get_all(mysql_iot, <<"SELECT * FROM device WHERE device_uuid != ''">>).
 
--spec get_host_devices(HostId :: integer()) -> {ok, Devices::list()} | {error, Reason::any()}.
+-spec get_host_devices(HostId :: integer()) -> {ok, Devices :: [binary()]} | {error, Reason::any()}.
 get_host_devices(HostId) when is_integer(HostId) ->
-    mysql_pool:get_all(mysql_iot, <<"SELECT * FROM device WHERE host_id = ? AND device_uuid != ''">>, [HostId]).
+    case mysql_pool:get_all(mysql_iot, <<"SELECT device_uuid FROM device WHERE host_id = ? AND device_uuid != ''">>, [HostId]) of
+        {ok, Devices} ->
+            {ok, lists:map(fun(#{<<"device_uuid">> := DeviceUUID}) -> DeviceUUID end, Devices)};
+        {error, Reason} ->
+            {error, Reason}
+    end.
 
 -spec get_device_by_uuid(DeviceUUID :: binary()) -> {ok, DeviceInfo :: map()} | undefined.
 get_device_by_uuid(DeviceUUID) when is_binary(DeviceUUID) ->
diff --git a/apps/iot/src/iot_device_sup.erl b/apps/iot/src/iot_device_sup.erl
index b863da3..f6ecbd1 100644
--- a/apps/iot/src/iot_device_sup.erl
+++ b/apps/iot/src/iot_device_sup.erl
@@ -32,14 +32,6 @@ delete_device(UUID) when is_binary(UUID) ->
     Id = iot_device:get_name(UUID),
     supervisor:terminate_child(?MODULE, Id).
 
-child_spec(Device = #{<<"device_uuid">> := DeviceUUID}) when is_binary(DeviceUUID) ->
-    Name = iot_device:get_name(DeviceUUID),
-    #{id => Name,
-        start => {iot_device, start_link, [Name, Device]},
-        restart => permanent,
-        shutdown => 2000,
-        type => worker,
-        modules => ['iot_device']};
 child_spec(DeviceUUID) when is_binary(DeviceUUID) ->
     Name = iot_device:get_name(DeviceUUID),
     #{id => Name,
diff --git a/apps/iot/src/iot_host.erl b/apps/iot/src/iot_host.erl
index 4d55892..b1e4782 100644
--- a/apps/iot/src/iot_host.erl
+++ b/apps/iot/src/iot_host.erl
@@ -58,7 +58,7 @@ get_pid(UUID) when is_binary(UUID) ->
 get_name(UUID) when is_binary(UUID) ->
     binary_to_atom(<<"iot_host:", UUID/binary>>).
 
--spec get_name(HostId :: integer()) -> atom().
+-spec get_alias_name(HostId :: integer()) -> atom().
 get_alias_name(HostId0) when is_integer(HostId0) ->
     HostId = integer_to_binary(HostId0),
     binary_to_atom(<<"iot_host_id:", HostId/binary>>).
@@ -153,8 +153,8 @@ init([UUID]) ->
                         end,
             %% 启动主机相关的device，此时device的状态为离线状态
             {ok, Devices} = device_bo:get_host_devices(HostId),
-            lists:foreach(fun(Device = #{<<"device_uuid">> := DeviceUUID}) ->
-                case iot_device_sup:start_device(Device) of
+            lists:foreach(fun(DeviceUUID) ->
+                case iot_device_sup:start_device(DeviceUUID) of
                     {ok, DevicePid} ->
                         iot_device:change_status(DevicePid, ?DEVICE_OFFLINE);
                     {error, Reason} ->
@@ -463,7 +463,7 @@ code_change(_OldVsn, StateName, State = #state{}, _Extra) ->
 
 change_devices_status(HostId, NewStatus) when is_integer(HostId), is_integer(NewStatus) ->
     {ok, Devices} = device_bo:get_host_devices(HostId),
-    lists:foreach(fun(#{<<"device_uuid">> := DeviceUUID}) ->
+    lists:foreach(fun(DeviceUUID) ->
         Pid = iot_device:get_pid(DeviceUUID),
         iot_device:change_status(Pid, NewStatus)
                   end, Devices).