diff --git a/apps/iot/src/iot_host.erl b/apps/iot/src/iot_host.erl
index 699c01a..4a45341 100644
--- a/apps/iot/src/iot_host.erl
+++ b/apps/iot/src/iot_host.erl
@@ -15,7 +15,7 @@
 %% API
 -export([start_link/2, get_name/1, get_pid/1, handle/2, reload/1, activate/2]).
 -export([get_metric/1, publish_message/4, get_aes/1]).
--export([has_session/1, create_session/2, attach_channel/2]).
+-export([create_session/2, attach_channel/2]).
 
 %% gen_statem callbacks
 -export([init/1, format_status/2, handle_event/4, terminate/3, code_change/4, callback_mode/0]).
@@ -71,10 +71,6 @@ activate(Pid, Auth) when is_pid(Pid), is_boolean(Auth) ->
 get_metric(Pid) when is_pid(Pid) ->
     gen_statem:call(Pid, get_metric).
 
--spec has_session(Pid :: pid()) -> boolean().
-has_session(Pid) when is_pid(Pid) ->
-    gen_statem:call(Pid, has_session).
-
 -spec attach_channel(pid(), pid()) -> ok.
 attach_channel(Pid, ChannelPid) when is_pid(Pid), is_pid(ChannelPid) ->
     gen_statem:call(Pid, {attach_channel, ChannelPid}).
@@ -160,10 +156,6 @@ handle_event({call, From}, get_metric, _, State) ->
 handle_event({call, From}, get_aes, _, State = #state{aes = Aes}) ->
     {keep_state, State, [{reply, From, {ok, Aes}}]};
 
-handle_event({call, From}, has_session, StateName, State) ->
-    HasSession = (StateName =:= session) orelse false,
-    {keep_state, State, [{reply, From, HasSession}]};
-
 %% 发送普通格式的消息, 激活的时候，会话时创建不成功的; 发送aes类型的命令的时候，必须要求session是存在的
 handle_event({call, From}, {publish_message, ReceiverPid, CommandType, {aes, Command0}}, session, State = #state{aes = AES, channel_pid = ChannelPid}) ->
     Command = iot_cipher_aes:encrypt(AES, Command0),