diff --git a/apps/iot/src/iot_device_sup.erl b/apps/iot/src/iot_device_sup.erl
index f6ecbd1..7f41d66 100644
--- a/apps/iot/src/iot_device_sup.erl
+++ b/apps/iot/src/iot_device_sup.erl
@@ -9,7 +9,7 @@
 
 -behaviour(supervisor).
 
--export([start_link/0, init/1, delete_device/1, start_device/1]).
+-export([start_link/0, init/1, delete_device/1, ensured_device_started/1]).
 
 start_link() ->
     supervisor:start_link({local, ?MODULE}, ?MODULE, []).
@@ -17,15 +17,20 @@ start_link() ->
 init([]) ->
     {ok, {#{strategy => one_for_one, intensity => 1000, period => 3600}, []}}.
 
--spec start_device(UUID :: binary()) -> {ok, Pid :: pid()} | {error, Reason :: any()}.
-start_device(DeviceUUID) when is_binary(DeviceUUID) ->
-    case supervisor:start_child(?MODULE, child_spec(DeviceUUID)) of
-        {ok, Pid} when is_pid(Pid) ->
-            {ok, Pid};
-        {error, {'already_started', Pid}} when is_pid(Pid) ->
-            {ok, Pid};
-        {error, Error} ->
-            {error, Error}
+-spec ensured_device_started(UUID :: binary()) -> {ok, Pid :: pid()} | {error, Reason :: any()}.
+ensured_device_started(DeviceUUID) when is_binary(DeviceUUID) ->
+    case iot_device:get_pid(DeviceUUID) of
+        undefined ->
+            case supervisor:start_child(?MODULE, child_spec(DeviceUUID)) of
+                {ok, Pid} when is_pid(Pid) ->
+                    {ok, Pid};
+                {error, {'already_started', Pid}} when is_pid(Pid) ->
+                    {ok, Pid};
+                {error, Error} ->
+                    {error, Error}
+            end;
+        Pid when is_pid(Pid) ->
+            {ok, Pid}
     end.
 
 delete_device(UUID) when is_binary(UUID) ->
diff --git a/apps/iot/src/iot_host.erl b/apps/iot/src/iot_host.erl
index b1e4782..fac5f36 100644
--- a/apps/iot/src/iot_host.erl
+++ b/apps/iot/src/iot_host.erl
@@ -154,7 +154,7 @@ init([UUID]) ->
             %% 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(DeviceUUID) ->
-                case iot_device_sup:start_device(DeviceUUID) of
+                case iot_device_sup:ensured_device_started(DeviceUUID) of
                     {ok, DevicePid} ->
                         iot_device:change_status(DevicePid, ?DEVICE_OFFLINE);
                     {error, Reason} ->
@@ -272,24 +272,19 @@ handle_event({call, From}, {create_session, PubKey}, StateName, State = #state{h
 
 %% 设备相关
 handle_event({call, From}, {reload_device, DeviceUUID}, StateName, State) ->
-    DeviceStatus = case StateName =:= ?STATE_SESSION of
-                       true  -> ?DEVICE_ONLINE;
-                       false -> ?DEVICE_OFFLINE
-                   end,
-    case iot_device:get_pid(DeviceUUID) of
-        undefined ->
-            case iot_device_sup:start_device(DeviceUUID) of
-                {ok, DevicePid} ->
-                    iot_device:change_status(DevicePid, DeviceStatus),
-                    {keep_state, State, [{reply, From, ok}]};
-                {error, Reason} ->
-                    {keep_state, State, [{reply, From, {error, Reason}}]}
-            end;
-        DevicePid when is_pid(DevicePid) ->
+    case iot_device_sup:ensured_device_started(DeviceUUID) of
+        {ok, DevicePid} ->
             iot_device:reload(DevicePid),
-            iot_device:change_status(DevicePid, DeviceStatus),
+            case StateName =:= ?STATE_SESSION of
+                true ->
+                    iot_device:change_status(DevicePid, ?DEVICE_ONLINE);
+                false ->
+                    iot_device:change_status(DevicePid, ?DEVICE_OFFLINE)
+            end,
 
-            {keep_state, State, [{reply, From, ok}]}
+            {keep_state, State, [{reply, From, ok}]};
+        {error, Reason} ->
+            {keep_state, State, [{reply, From, {error, Reason}}]}
     end;
 
 handle_event({call, From}, {delete_device, DeviceUUID}, _, State) ->
@@ -302,25 +297,19 @@ handle_event({call, From}, {delete_device, DeviceUUID}, _, State) ->
     {keep_state, State, [{reply, From, ok}]};
 
 handle_event({call, From}, {activate_device, DeviceUUID, Auth}, StateName, State) ->
-    DeviceStatus = case StateName =:= ?STATE_SESSION of
-                       true  -> ?DEVICE_ONLINE;
-                       false -> ?DEVICE_OFFLINE
-                   end,
-
-    case iot_device:get_pid(DeviceUUID) of
-        undefined ->
-            case iot_device_sup:start_device(DeviceUUID) of
-                {ok, Pid} ->
-                    iot_device:auth(Pid, Auth),
-                    iot_device:change_status(Pid, DeviceStatus),
-                    {keep_state, State, [{reply, From, ok}]};
-                {error, Reason} ->
-                    {keep_state, State, [{reply, From, {error, Reason}}]}
-            end;
-        DevicePid when is_pid(DevicePid) ->
+    case iot_device_sup:ensured_device_started(DeviceUUID) of
+        {ok, DevicePid} ->
             iot_device:auth(DevicePid, Auth),
-            iot_device:change_status(DevicePid, DeviceStatus),
-            {keep_state, State, [{reply, From, ok}]}
+            case StateName =:= ?STATE_SESSION of
+                true ->
+                    iot_device:change_status(DevicePid, ?DEVICE_ONLINE);
+                false ->
+                    iot_device:change_status(DevicePid, ?DEVICE_OFFLINE)
+            end,
+
+            {keep_state, State, [{reply, From, ok}]};
+        {error, Reason} ->
+            {keep_state, State, [{reply, From, {error, Reason}}]}
     end;
 
 %% 需要将消息转换成json格式然后再处理, 需要在host进程里面处理, 数据带有props，服务端暂时未用到