diff --git a/apps/iot/src/iot_host.erl b/apps/iot/src/iot_host.erl
index 79f0fa9..e4cf309 100644
--- a/apps/iot/src/iot_host.erl
+++ b/apps/iot/src/iot_host.erl
@@ -337,11 +337,13 @@ handle_event({call, From}, {attach_channel, _}, _, State = #state{uuid = UUID, c
     {keep_state, State, [{reply, From, {error, <<"channel existed">>}}]};
 
 %% 授权通过后，才能将主机的状态设置为在线状态
-handle_event({call, From}, {create_session, PubKey}, ?STATE_ACTIVATED, State = #state{uuid = UUID, aes = Aes}) ->
+handle_event({call, From}, {create_session, PubKey}, ?STATE_ACTIVATED, State = #state{uuid = UUID, aes = Aes, name = Name}) ->
     Reply = #{<<"a">> => true, <<"aes">> => Aes},
     EncReply = iot_cipher_rsa:encode(Reply, PubKey),
     {ok, AffectedRow} = host_bo:change_status(UUID, ?HOST_ONLINE),
+    warn_status(Name, <<"在线"/utf8>>),
     report_event(UUID, ?HOST_ONLINE),
+
     lager:debug("[iot_host] host_id(session) uuid: ~p, create_session, will change status, affected_row: ~p", [UUID, AffectedRow]),
     {keep_state, State#state{has_session = true}, [{reply, From, {ok, <<10:8, EncReply/binary>>}}]};
 
@@ -514,7 +516,7 @@ handle_event(cast, heartbeat, _, State = #state{heartbeat_counter = HeartbeatCou
     {keep_state, State#state{heartbeat_counter = HeartbeatCounter + 1}};
 
 %% 没有收到心跳包，主机下线, 设备状态不变
-handle_event(info, {timeout, _, heartbeat_ticker}, _, State = #state{uuid = UUID, heartbeat_counter = 0, channel_pid = ChannelPid}) ->
+handle_event(info, {timeout, _, heartbeat_ticker}, _, State = #state{uuid = UUID, heartbeat_counter = 0, name = Name, channel_pid = ChannelPid}) ->
     lager:warning("[iot_host] uuid: ~p, heartbeat lost, devices will unknown", [UUID]),
     {ok, #{<<"status">> := Status}} = host_bo:get_host_by_uuid(UUID),
     case Status of
@@ -524,6 +526,7 @@ handle_event(info, {timeout, _, heartbeat_ticker}, _, State = #state{uuid = UUID
             lager:debug("[iot_host] host: ~p, host_maybe_offline, host now is offline, do nothing", [UUID]);
         ?HOST_ONLINE ->
             {ok, _} = host_bo:change_status(UUID, ?HOST_OFFLINE),
+            warn_status(Name, <<"离线"/utf8>>),
             report_event(UUID, ?HOST_OFFLINE)
     end,
 
@@ -631,6 +634,13 @@ report_event(UUID, NewStatus) when is_binary(UUID), is_integer(NewStatus) ->
     iot_router:route_uuid(UUID, FieldsList, Timestamp),
     lager:debug("[iot_host] host_uuid: ~p, route fields: ~p", [UUID, FieldsList]).
 
+%% 报警主机的状态
+warn_status(Name, Status) when is_binary(Name), is_binary(Status) ->
+    Warn = iolist_to_binary([<<"主机: "/utf8>>, Name, <<" || ">>, Status]),
+    iot_watchdog:warn(Warn);
+warn_status(_, _) ->
+    ok.
+
 %% 将当前的state转换成map
 state_map(#state{host_id = HostId, uuid = UUID, aes = Aes, has_session = HasSession, heartbeat_counter = HeartbeatCounter, channel_pid = ChannelPid, metrics = Metrics}) ->
     #{
diff --git a/apps/iot/src/iot_watchdog.erl b/apps/iot/src/iot_watchdog.erl
index 9aeea3c..83310cd 100644
--- a/apps/iot/src/iot_watchdog.erl
+++ b/apps/iot/src/iot_watchdog.erl
@@ -13,9 +13,7 @@
 
 %% API
 -export([start_link/0]).
--export([detection/3]).
-
--export([test/0]).
+-export([detection/3, warn/1]).
 
 %% gen_server callbacks
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
@@ -43,21 +41,6 @@
     limiters = #{}
 }).
 
-test() ->
-    Metric = #{
-        <<"cpu_temperature">> => 90.5,
-        <<"disk">> => #{
-            <<"total">> => 7129,
-            <<"used">> => 345
-        },
-        <<"memory">> => #{
-            <<"total">> => 990,
-            <<"used">> => 900
-        }
-    },
-    detection(<<"1234">>, <<"test1234">>, Metric).
-
-
 %%%===================================================================
 %%% API
 %%%===================================================================
@@ -68,6 +51,10 @@ detection(HostUUID, Name, Metric) when is_binary(HostUUID), is_binary(Name), is_
 detection(HostUUID, Name, _) when is_binary(HostUUID), is_binary(Name) ->
     ok.
 
+-spec warn(Warn :: binary()) -> no_return().
+warn(Warn) when is_binary(Warn) ->
+    gen_server:cast(?SERVER, {warn, Warn}).
+
 %% @doc Spawns the server and registers the local name (unique)
 -spec(start_link() ->
     {ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
@@ -137,7 +124,6 @@ handle_cast({detection, HostUUID, Name, Metric},
             Body = format_warn(Subject, Users, PriKey),
             case catch do_post(Url, Body) of
                 {ok, Resp} ->
-                    lager:debug("[iot_watchdog] url: ~p, body: ~ts, resp: ~ts", [Url, Body, Resp]),
                     iot_logger:write(LoggerPid, [Body, Resp]);
                 {error, Reason} ->
                     lager:warning("[iot_watchdog] url: ~p, send body: ~ts, get error: ~p", [Url, Body, Reason])
@@ -146,7 +132,17 @@ handle_cast({detection, HostUUID, Name, Metric},
             ok
     end,
 
-    {noreply, State#state{limiters = maps:put(HostUUID, NLimiter, Limiters)}}.
+    {noreply, State#state{limiters = maps:put(HostUUID, NLimiter, Limiters)}};
+
+handle_cast({warn, Warn}, State = #state{url = Url, users = Users, pri_key = PriKey, logger_pid = LoggerPid}) ->
+    Body = format_warn(Warn, Users, PriKey),
+    case catch do_post(Url, Body) of
+        {ok, Resp} ->
+            iot_logger:write(LoggerPid, [Body, Resp]);
+        {error, Reason} ->
+            lager:warning("[iot_watchdog] url: ~p, send body: ~ts, get error: ~p", [Url, Body, Reason])
+    end,
+    {noreply, State}.
 
 %% @private
 %% @doc Handling all non call/cast messages