diff --git a/include/domain_model.hrl b/include/domain_model.hrl
new file mode 100644
index 0000000..3c89f80
--- /dev/null
+++ b/include/domain_model.hrl
@@ -0,0 +1,20 @@
+%%%-------------------------------------------------------------------
+%%% @author Codex
+%%% @doc
+%%% 领域模型定义
+%%% @end
+%%%-------------------------------------------------------------------
+
+-record(host_info, {
+    id :: integer(),
+    uuid :: binary(),
+    authorize_status :: integer(),
+    status :: integer()
+}).
+
+-record(device_info, {
+    id :: integer(),
+    host_id :: integer(),
+    device_uuid :: binary(),
+    status :: integer()
+}).
diff --git a/src/adapters/control_api/iot_api_client.erl b/src/adapters/control_api/iot_api_client.erl
index 88555f8..acc758a 100644
--- a/src/adapters/control_api/iot_api_client.erl
+++ b/src/adapters/control_api/iot_api_client.erl
@@ -8,6 +8,7 @@
 %%%-------------------------------------------------------------------
 -module(iot_api_client).
 -author("anlicheng").
+-include("domain_model.hrl").
 
 %% API
 -export([ai_event/1]).
@@ -31,20 +32,30 @@ get_all_hosts() ->
             []
     end.
 
--spec get_host_by_uuid(UUID :: binary()) -> undefined | {ok, HostInfo :: map()}.
+-spec get_host_by_uuid(UUID :: binary()) -> undefined | {ok, HostInfo :: #host_info{}}.
 get_host_by_uuid(UUID) when is_binary(UUID) ->
     case do_get("/get_host_by_uuid", [{<<"uuid">>, UUID}]) of
         {ok, HostInfo} ->
-            {ok, HostInfo};
+            case host_info_record(HostInfo) of
+                {ok, Record} ->
+                    {ok, Record};
+                error ->
+                    undefined
+            end;
         _ ->
             undefined
     end.
 
--spec get_host_by_id(HostId :: integer()) -> undefined | {ok, HostInfo :: map()}.
+-spec get_host_by_id(HostId :: integer()) -> undefined | {ok, HostInfo :: #host_info{}}.
 get_host_by_id(HostId) when is_integer(HostId) ->
     case do_get("/get_host_by_id", [{<<"host_id">>, integer_to_binary(HostId)}]) of
         {ok, HostInfo} ->
-            {ok, HostInfo};
+            case host_info_record(HostInfo) of
+                {ok, Record} ->
+                    {ok, Record};
+                error ->
+                    undefined
+            end;
         _ ->
             undefined
     end.
@@ -54,15 +65,27 @@ get_host_by_id(HostId) when is_integer(HostId) ->
 change_host_status(UUID, NStatus) when is_binary(UUID), is_integer(NStatus) ->
     do_post("/change_host_status", #{<<"uuid">> => UUID, <<"new_status">> => NStatus}).
 
--spec get_host_devices(HostId :: integer()) -> {ok, Devices :: [map()]} | {error, Reason::any()}.
+-spec get_host_devices(HostId :: integer()) -> {ok, Devices :: [#device_info{}]} | {error, Reason::any()}.
 get_host_devices(HostId) when is_integer(HostId) ->
-    do_get("/get_host_devices", [{<<"host_id">>, integer_to_binary(HostId)}]).
+    case do_get("/get_host_devices", [{<<"host_id">>, integer_to_binary(HostId)}]) of
+        {ok, DeviceInfos} when is_list(DeviceInfos) ->
+            device_info_records(DeviceInfos);
+        {ok, _Other} ->
+            {error, invalid_device_infos};
+        Error ->
+            Error
+    end.
 
--spec get_device_by_uuid(DeviceUUID :: binary()) -> {ok, DeviceInfo :: map()} | undefined.
+-spec get_device_by_uuid(DeviceUUID :: binary()) -> {ok, DeviceInfo :: #device_info{}} | undefined.
 get_device_by_uuid(DeviceUUID) when is_binary(DeviceUUID) ->
     case do_get("/get_device_by_uuid", [{<<"device_uuid">>, DeviceUUID}]) of
         {ok, DeviceInfo} ->
-            {ok, DeviceInfo};
+            case device_info_record(DeviceInfo) of
+                {ok, Record} ->
+                    {ok, Record};
+                error ->
+                    undefined
+            end;
         _ ->
             undefined
     end.
@@ -197,3 +220,40 @@ do_get(Path, Params) when is_list(Path), is_list(Params) ->
             logger:warning("[iot_api_client] request url: ~p, get error is: ~p", [Url, Reason]),
             {error, Reason}
     end.
+
+-spec host_info_record(map()) -> {ok, #host_info{}} | error.
+host_info_record(#{<<"id">> := Id, <<"uuid">> := UUID, <<"authorize_status">> := AuthorizeStatus, <<"status">> := Status})
+        when is_integer(Id), is_binary(UUID), is_integer(AuthorizeStatus), is_integer(Status) ->
+    {ok, #host_info{
+        id = Id,
+        uuid = UUID,
+        authorize_status = AuthorizeStatus,
+        status = Status
+    }};
+host_info_record(_) ->
+    error.
+
+-spec device_info_record(map()) -> {ok, #device_info{}} | error.
+device_info_record(#{<<"id">> := Id, <<"host_id">> := HostId, <<"device_uuid">> := DeviceUUID, <<"status">> := Status})
+        when is_integer(Id), is_integer(HostId), is_binary(DeviceUUID), is_integer(Status) ->
+    {ok, #device_info{
+        id = Id,
+        host_id = HostId,
+        device_uuid = DeviceUUID,
+        status = Status
+    }};
+device_info_record(_) ->
+    error.
+
+-spec device_info_records([map()]) -> {ok, [#device_info{}]} | {error, invalid_device_info}.
+device_info_records(DeviceInfos) ->
+    lists:foldr(fun(DeviceInfo, Acc) ->
+        case {device_info_record(DeviceInfo), Acc} of
+            {{ok, Record}, {ok, Records}} ->
+                {ok, [Record | Records]};
+            {error, _} ->
+                {error, invalid_device_info};
+            {_, Error = {error, _}} ->
+                Error
+        end
+    end, {ok, []}, DeviceInfos).
diff --git a/src/host/iot_host.erl b/src/host/iot_host.erl
index af1120f..41903b7 100644
--- a/src/host/iot_host.erl
+++ b/src/host/iot_host.erl
@@ -9,6 +9,7 @@
 -module(iot_host).
 -author("aresei").
 -include("iot.hrl").
+-include("domain_model.hrl").
 -include("protocol.hrl").
 -include("message_pb.hrl").
 
@@ -171,7 +172,7 @@ start_link(Name, UUID) when is_atom(Name), is_binary(UUID) ->
 init([UUID]) ->
     ok = iot_log:set_metadata(),
     case iot_api_client:get_host_by_uuid(UUID) of
-        {ok, #{<<"id">> := HostId, <<"authorize_status">> := AuthorizeStatus}} ->
+        {ok, #host_info{id = HostId, authorize_status = AuthorizeStatus}} ->
             %% 通过host_id注册别名, 可以避免通过查询数据库获取HostPid
             AliasName = get_alias_name(HostId),
             global:register_name(AliasName, self()),
@@ -324,7 +325,7 @@ handle_event(cast, heartbeat, _, State = #state{heartbeat_counter = HeartbeatCou
 %% 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}) ->
     logger:warning("[iot_host] uuid: ~p, heartbeat lost, devices will unknown", [UUID]),
-    {ok, #{<<"status">> := Status}} = iot_api_client:get_host_by_uuid(UUID),
+    {ok, #host_info{status = Status}} = iot_api_client:get_host_by_uuid(UUID),
     case Status of
         ?HOST_NOT_JOINED ->
             logger:debug("[iot_host] host: ~p, host_maybe_offline, host not joined, can not change to offline", [UUID]);
diff --git a/src/host/iot_host_sup.erl b/src/host/iot_host_sup.erl
index cfc6d51..aa22324 100644
--- a/src/host/iot_host_sup.erl
+++ b/src/host/iot_host_sup.erl
@@ -37,7 +37,7 @@ ensured_host_started(UUID) when is_binary(UUID) ->
             {ok, Pid}
     end.
 
-delete_host(UUID) ->
+delete_host(UUID) when is_binary(UUID) ->
     Id = iot_host:get_name(UUID),
     ok = supervisor:terminate_child(?MODULE, Id),
     case supervisor:delete_child(?MODULE, Id) of
@@ -49,7 +49,8 @@ delete_host(UUID) ->
             ok
     end.
 
-child_spec(UUID) ->
+-spec child_spec(UUID :: binary()) -> map().
+child_spec(UUID) when is_binary(UUID) ->
     Id = iot_host:get_name(UUID),
     #{id => Id,
         start => {iot_host, start_link, [Id, UUID]},
diff --git a/src/simulator/simulator_api_handler.erl b/src/simulator/simulator_api_handler.erl
index 4e2b376..f9be473 100644
--- a/src/simulator/simulator_api_handler.erl
+++ b/src/simulator/simulator_api_handler.erl
@@ -10,7 +10,7 @@
 
 -export([handle_request/4]).
 
--define(HOST_UUID, <<"sim-host-001">>).
+-define(HOST_UUID, <<"qbxmjyzrkpntfgswaevodhluicqzxplkm">>).
 -define(HOST_ID, 1).
 -define(DEVICE_UUID, <<"sim-device-001">>).
 -define(DEVICE_ID, 1).