diff --git a/apps/iot/src/model/terminal_model.erl b/apps/iot/src/model/terminal_model.erl
index 74284cf..88576c3 100644
--- a/apps/iot/src/model/terminal_model.erl
+++ b/apps/iot/src/model/terminal_model.erl
@@ -13,6 +13,7 @@
 
 %% API
 -export([get_all_terminals/0, get_status_stat/0]).
+-export([change_status/2, delete/1]).
 
 %% 获取app信息
 get_all_terminals() ->
@@ -64,14 +65,14 @@ insert(Id, HostId, Name, ProductId, VendorId, Model, CellId) ->
             {error, Error}
     end.
 
-change_status(Id, Status) ->
+change_status(TerminalId, Status) when is_binary(TerminalId), is_integer(Status) ->
     Fun = fun() ->
-        case mnesia:read(host, Id) of
+        case mnesia:read(terminal, TerminalId) of
             [] ->
-                mnesia:abort(<<"appinfo not found">>);
-            [Host] ->
-                NHost = Host#host{status = Status},
-                mnesia:write(host, NHost, write)
+                mnesia:abort(<<"terminal not found">>);
+            [Terminal] ->
+                NTerminal = Terminal#host{status = Status},
+                mnesia:write(terminal, NTerminal, write)
         end
           end,
     case mnesia:transaction(Fun) of
@@ -81,8 +82,51 @@ change_status(Id, Status) ->
             {error, Reason}
     end.
 
-delete(Id) ->
-    case mnesia:transaction(fun() -> mnesia:delete(host, Id, write) end) of
+update_metric(TerminalId, MetricName, MetricSymbol, MetricValue) when is_binary(TerminalId), is_binary(MetricName), is_binary(MetricSymbol), is_number(MetricValue) ->
+    Fun = fun() ->
+        case mnesia:read(terminal, TerminalId) of
+            [] ->
+                mnesia:abort(<<"terminal not found">>);
+            [Terminal = #terminal{metrics = Metrics}] ->
+                NMetrics = case lists:any(fun(#terminal_metric{symbol = Symbol}) -> Symbol =:= MetricSymbol end, Metrics) of
+                               true ->
+                                   lists:map(fun(Metric=#terminal_metric{symbol = Symbol, serial_values = SerialValues}) ->
+                                       case Symbol =:= MetricSymbol of
+                                           true ->
+                                               NSerialValues = case queue:len(SerialValues) >= 100 of
+                                                                   true ->
+                                                                       SerialValues0 = queue:drop(SerialValues),
+                                                                       queue:in(MetricValue, SerialValues0);
+                                                                   false ->
+                                                                       queue:in(MetricValue, SerialValues)
+                                                               end,
+                                               Metric#terminal_metric{
+                                                   name = MetricName,
+                                                   last_value = MetricValue,
+                                                   update_ts = iot_util:current_time(),
+                                                   serial_values = NSerialValues
+                                               };
+                                           false ->
+                                               Metric
+                                       end
+                                             end, Metrics);
+                               false ->
+                                   Metrics#terminal_metric{}
+                           end,
+                mnesia:write(terminal, Terminal#terminal{metrics = NMetrics}, write)
+        end
+          end,
+
+    case mnesia:transaction(Fun) of
+        {atomic, ok} ->
+            ok;
+        {aborted, Reason} ->
+            {error, Reason}
+    end.
+
+
+delete(TerminalId) when is_binary(TerminalId) ->
+    case mnesia:transaction(fun() -> mnesia:delete(terminal, TerminalId, write) end) of
         {atomic, ok} ->
             ok;
         {aborted, Reason} ->