diff --git a/apps/iot/src/iot_app.erl b/apps/iot/src/iot_app.erl
index 2cbe8b9..4932150 100644
--- a/apps/iot/src/iot_app.erl
+++ b/apps/iot/src/iot_app.erl
@@ -16,9 +16,10 @@ start(_StartType, _StartArgs) ->
     %% 加速内存的回收
     erlang:system_flag(fullsweep_after, 16),
 
-    {ok, SupPid} = iot_sup:start_link(),
     %% 启动数据库
     start_mnesia(),
+
+    {ok, SupPid} = iot_sup:start_link(),
     %% 启动udp服务
     start_udp_server(),
     %% 启动http服务