diff --git a/src/emqttd_plugins.erl b/src/emqttd_plugins.erl
index 384a595de..8735253ad 100644
--- a/src/emqttd_plugins.erl
+++ b/src/emqttd_plugins.erl
@@ -27,7 +27,7 @@
 -export([list/0]).
 
 init() ->
-    case emqttd:conf(plugins_etc_dir) of
+    case emqttd:env(plugins_etc_dir) of
         {ok, PluginsEtc} ->
             CfgFiles = filelib:wildcard("*.conf", PluginsEtc),
             lists:foreach(fun(CfgFile) ->
@@ -42,7 +42,7 @@ init() ->
 %% @doc Load all plugins when the broker started.
 -spec(load() -> list() | {error, any()}).
 load() ->
-    case emqttd:conf(plugins_loaded_file) of
+    case emqttd:env(plugins_loaded_file) of
         {ok, File} ->
             ensure_file(File),
             with_loaded_file(File, fun(Names) -> load_plugins(Names, false) end);
@@ -75,7 +75,7 @@ load_plugins(Names, Persistent) ->
 %% @doc Unload all plugins before broker stopped.
 -spec(unload() -> list() | {error, any()}).
 unload() ->
-    case emqttd:conf(plugins_loaded_file) of
+    case emqttd:env(plugins_loaded_file) of
         {ok, File} ->
             with_loaded_file(File, fun stop_plugins/1);
         undefined ->
@@ -89,7 +89,7 @@ stop_plugins(Names) ->
 %% @doc List all available plugins
 -spec(list() -> [mqtt_plugin()]).
 list() ->
-    case emqttd:conf(plugins_etc_dir) of
+    case emqttd:env(plugins_etc_dir) of
         {ok, PluginsEtc} -> 
             CfgFiles = filelib:wildcard("*.conf", PluginsEtc),
             Plugins = [plugin(CfgFile) || CfgFile <- CfgFiles],
@@ -244,7 +244,7 @@ plugin_unloaded(Name, true) ->
     end.
 
 read_loaded() ->
-    case emqttd:conf(plugins_loaded_file) of
+    case emqttd:env(plugins_loaded_file) of
         {ok, File} -> read_loaded(File);
         undefined  -> {error, not_found}
     end.
@@ -252,7 +252,7 @@ read_loaded() ->
 read_loaded(File) -> file:consult(File).
 
 write_loaded(AppNames) ->
-    {ok, File} = emqttd:conf(plugins_loaded_file),
+    {ok, File} = emqttd:env(plugins_loaded_file),
     case file:open(File, [binary, write]) of
         {ok, Fd} ->
             lists:foreach(fun(Name) ->
diff --git a/src/emqttd_protocol.erl b/src/emqttd_protocol.erl
index f3579d46b..038d30b91 100644
--- a/src/emqttd_protocol.erl
+++ b/src/emqttd_protocol.erl
@@ -448,7 +448,7 @@ authenticate(Client, Password) ->
 
 %% PUBLISH ACL is cached in process dictionary.
 check_acl(publish, Topic, Client) ->
-    IfCache = emqttd:conf(cache_acl, true),
+    IfCache = emqttd:env(cache_acl, true),
     case {IfCache, get({acl, publish, Topic})} of
         {true, undefined} ->
             AllowDeny = emqttd_access_control:check_acl(Client, publish, Topic),
diff --git a/src/emqttd_sysmon_sup.erl b/src/emqttd_sysmon_sup.erl
index 3ed8e36a5..9ba73b41e 100644
--- a/src/emqttd_sysmon_sup.erl
+++ b/src/emqttd_sysmon_sup.erl
@@ -28,15 +28,8 @@ start_link() ->
     supervisor:start_link({local, ?MODULE}, ?MODULE, []).
 
 init([]) ->
-    Sysmon = {sysmon, {emqttd_sysmon, start_link, [opts()]},
+	{ok, Env} = emqttd:env(sysmon),
+    Sysmon = {sysmon, {emqttd_sysmon, start_link, [Env]},
                 permanent, 5000, worker, [emqttd_sysmon]},
     {ok, {{one_for_one, 10, 100}, [Sysmon]}}.
 
-opts() ->
-    Opts = [{long_gc,        emqttd:conf(sysmon_long_gc)},
-            {long_schedule,  emqttd:conf(sysmon_long_schedule)},
-            {large_heap,     emqttd:conf(sysmon_large_heap)},
-            {busy_port,      emqttd:conf(busy_port)},
-            {busy_dist_port, emqttd:conf(sysmon_busy_dist_port)}],
-    [{Key, Val} || {Key, {ok, Val}} <- Opts].
-