diff --git a/apps/iot/src/http_handler/device_handler.erl b/apps/iot/src/http_handler/device_handler.erl
index 3c4308c..d5dcf30 100644
--- a/apps/iot/src/http_handler/device_handler.erl
+++ b/apps/iot/src/http_handler/device_handler.erl
@@ -63,6 +63,32 @@ handle_request("POST", "/device/activate", _, #{<<"host_id">> := HostId, <<"devi
             end
     end;
 
+%% 重新加载对应的主机信息
+handle_request("POST", "/device/query", _, Params = #{<<"device_uuid">> := DeviceUUID}) when is_binary(DeviceUUID) ->
+    lager:debug("[device_handler] query device uuid: ~p, params: ~p", [DeviceUUID, Params]),
+    case iot_device:get_pid(DeviceUUID) of
+        undefined ->
+            {ok, 200, iot_util:json_error(404, <<"device not found">>)};
+        DevicePid when is_pid(DevicePid) ->
+            Tags = maps:get(<<"tags">>, Params, #{}),
+            StartTs = maps:get(<<"start_ts">>, Params, 0),
+            StopTs = maps:get(<<"stop_ts">>, Params, 0),
+            Limit = maps:get(<<"limit">>, Params, 0),
+
+            case is_map(Tags) andalso is_integer(StartTs) andalso is_integer(StopTs) andalso is_integer(Limit)
+                andalso StartTs >= 0 andalso StopTs >= 0 andalso Limit >= 0 of
+
+                true ->
+                    {ok, DeviceDataList} = iot_device:query(DevicePid, Tags, StartTs, StopTs, Limit),
+                    DataItems = lists:map(fun(#device_data{tags = Tags, val = Val, timestamp = Timestamp}) ->
+                        #{<<"tags">> => Tags, <<"val">> => Val, <<"timestamp">> => Timestamp}
+                                          end, DeviceDataList),
+                    {ok, 200, iot_util:json_data(DataItems)};
+                false ->
+                    {ok, 200, iot_util:json_error(404, <<"invalid params">>)}
+            end
+    end;
+
 handle_request(_, Path, _, _) ->
     Path1 = list_to_binary(Path),
     {ok, 200, iot_util:json_error(-1, <<"url: ", Path1/binary, " not found">>)}.
\ No newline at end of file
diff --git a/apps/iot/src/iot_device.erl b/apps/iot/src/iot_device.erl
index 8c0cafc..08debcf 100644
--- a/apps/iot/src/iot_device.erl
+++ b/apps/iot/src/iot_device.erl
@@ -55,8 +55,9 @@ serialize(FieldsList) when is_list(FieldsList) ->
     lists:flatmap(fun serialize0/1, FieldsList).
 serialize0(Fields = #{<<"key">> := Key}) when is_binary(Key) andalso Key /= <<>> ->
     Values = maps:remove(<<"key">>, Fields),
-    S = base64:encode(iolist_to_binary(jiffy:encode(#{Key => Values}, [force_utf8]))),
-    [<<"base64:", S/binary>>];
+    %S = base64:encode(iolist_to_binary(jiffy:encode(#{Key => Values}, [force_utf8]))),
+    %[<<"base64:", S/binary>>];
+    [#{Key => Values}];
 serialize0(_) ->
     [].
 
@@ -106,7 +107,8 @@ auth(Pid, Auth) when is_pid(Pid), is_boolean(Auth) ->
 data(Pid, DataList) when is_pid(Pid), is_list(DataList) ->
     gen_statem:cast(Pid, {data, DataList}).
 
-query(Pid, Tags, StartTs, StopTs, Limit) when is_pid(Pid), is_map(Tags), is_integer(StartTs), is_integer(StopTs), is_integer(Limit) ->
+-spec query(Pid :: pid(), Tags :: map(), StartTs :: integer(), StopTs :: integer(), Limit :: integer()) -> {ok, [#device_data{}]}.
+query(Pid, Tags, StartTs, StopTs, Limit) when is_pid(Pid), is_map(Tags), is_integer(StartTs), is_integer(StopTs), is_integer(Limit), StartTs >= 0, StopTs >= 0, Limit >= 0 ->
     gen_statem:call(Pid, {query, Tags, StartTs, StopTs, Limit}).
 
 %% @doc Creates a gen_statem process which calls Module:init/1 to
@@ -226,7 +228,7 @@ handle_event({call, From}, {query, Tags, StartTs, StopTs, Limit}, _StateName, St
              false ->
                  lists:sublist(L3, 1, Limit)
          end,
-    {keep_state, State, [{reply, From, L4}]};
+    {keep_state, State, [{reply, From, {ok, L4}}]};
 
 %% 处理授权
 handle_event(cast, {auth, Auth}, StateName, State = #state{device_uuid = DeviceUUID}) ->
diff --git a/apps/iot/src/iot_util.erl b/apps/iot/src/iot_util.erl
index 026816e..63e7196 100644
--- a/apps/iot/src/iot_util.erl
+++ b/apps/iot/src/iot_util.erl
@@ -82,9 +82,8 @@ chunks0([Hd | Tail], Size, Num, Target, AccTarget) ->
     chunks0(Tail, Size, Num - 1, [Hd | Target], AccTarget).
 
 json_data(Data) ->
-    jiffy:encode(#{
-        <<"result">> => Data
-    }, [force_utf8]).
+    Json = jiffy:encode(#{<<"result">> => Data}, [force_utf8]),
+    iolist_to_binary(Json).
 
 json_error(ErrCode, ErrMessage) when is_integer(ErrCode), is_binary(ErrMessage) ->
     jiffy:encode(#{