diff --git a/apps/emqx_slow_subs/src/emqx_slow_subs.erl b/apps/emqx_slow_subs/src/emqx_slow_subs.erl
index e0eb5e3eb..1da28d4fa 100644
--- a/apps/emqx_slow_subs/src/emqx_slow_subs.erl
+++ b/apps/emqx_slow_subs/src/emqx_slow_subs.erl
@@ -301,13 +301,16 @@ do_clear_history() ->
     ets:delete_all_objects(?TOPK_TAB).
 
 check_enable(Enable, #{enable := IsEnable} = State) ->
-    case Enable of
-        IsEnable ->
-            State;
-        true ->
+    case {IsEnable, Enable} of
+        {false, true} ->
             load(State);
+        {true, false} ->
+            unload(State);
+        {true, true} ->
+            S1 = unload(State),
+            load(S1);
         _ ->
-            unload(State)
+            State
     end.
 
 start_timer(Name, Fun, State) ->
diff --git a/apps/emqx_slow_subs/test/emqx_slow_subs_SUITE.erl b/apps/emqx_slow_subs/test/emqx_slow_subs_SUITE.erl
index 21ca43e87..1ddf59058 100644
--- a/apps/emqx_slow_subs/test/emqx_slow_subs_SUITE.erl
+++ b/apps/emqx_slow_subs/test/emqx_slow_subs_SUITE.erl
@@ -22,15 +22,16 @@
 -include_lib("eunit/include/eunit.hrl").
 -include_lib("emqx/include/emqx_mqtt.hrl").
 -include_lib("emqx/include/emqx.hrl").
+-include_lib("emqx_slow_subs/include/emqx_slow_subs.hrl").
 
--define(TOPK_TAB, emqx_slow_subs_topk).
 -define(NOW, erlang:system_time(millisecond)).
+-define(CLUSTER_RPC_SHARD, emqx_cluster_rpc_shard).
 
 -define(BASE_CONF, <<"""
 slow_subs {
     enable = true
 	top_k_num = 5,
-    expire_interval = 3000
+    expire_interval = 5m
     stats_type = whole
     }""">>).
 
@@ -38,23 +39,48 @@ all() ->
     emqx_common_test_helpers:all(?MODULE).
 
 init_per_suite(Config) ->
+    application:load(emqx_conf),
+    ok = ekka:start(),
+    ok = mria_rlog:wait_for_shards([?CLUSTER_RPC_SHARD], infinity),
+    meck:new(emqx_alarm, [non_strict, passthrough, no_link]),
+    meck:expect(emqx_alarm, activate, 3, ok),
+    meck:expect(emqx_alarm, deactivate, 3, ok),
+
+
     ok = emqx_common_test_helpers:load_config(emqx_slow_subs_schema, ?BASE_CONF),
     emqx_common_test_helpers:start_apps([emqx_slow_subs]),
     Config.
 
 end_per_suite(_Config) ->
+    ekka:stop(),
+    mria:stop(),
+    mria_mnesia:delete_schema(),
+    meck:unload(emqx_alarm),
+
     emqx_common_test_helpers:stop_apps([emqx_slow_subs]).
 
+init_per_testcase(t_expire, Config) ->
+    {ok, _} = emqx_cluster_rpc:start_link(),
+    Cfg = emqx_config:get([slow_subs]),
+    emqx_slow_subs:update_settings(Cfg#{expire_interval := 1500}),
+    Config;
+
 init_per_testcase(_, Config) ->
     Config.
 
 end_per_testcase(_, _) ->
+    case erlang:whereis(node()) of
+        undefined -> ok;
+        P ->
+            erlang:unlink(P),
+            erlang:exit(P, kill)
+    end,
     ok.
 
 %%--------------------------------------------------------------------
 %% Test Cases
 %%--------------------------------------------------------------------
-t_log_and_pub(_) ->
+t_pub(_) ->
     %% Sub topic first
     Subs = [{<<"/test1/+">>, ?QOS_1}, {<<"/test2/+">>, ?QOS_2}],
     Clients = start_client(Subs),
@@ -78,14 +104,26 @@ t_log_and_pub(_) ->
 
     timer:sleep(1000),
     Size = ets:info(?TOPK_TAB, size),
-    %% some time record maybe delete due to it expired
-    ?assert(Size =< 6 andalso Size > 3),
+    ?assert(Size =< 6 andalso Size >= 5),
 
-    timer:sleep(4000),
-    ?assert(ets:info(?TOPK_TAB, size) =:= 0),
     [Client ! stop || Client <- Clients],
     ok.
 
+t_expire(_) ->
+    Now = ?NOW,
+    Each = fun(I) ->
+                   ClientId = erlang:list_to_binary(io_lib:format("test_~p", [I])),
+                   ets:insert(?TOPK_TAB, #top_k{index = ?TOPK_INDEX(1, ?ID(ClientId, <<"topic">>)),
+                                                last_update_time = Now - timer:minutes(5)})
+           end,
+
+    lists:foreach(Each, lists:seq(1, 5)),
+
+    timer:sleep(3000),
+    Size = ets:info(?TOPK_TAB, size),
+    ?assertEqual(0, Size),
+    ok.
+
 start_client(Subs) ->
     [spawn(fun() -> client(I, Subs) end) || I <- lists:seq(1, 10)].