diff --git a/src/gausskernel/process/postmaster/autovacuum.cpp b/src/gausskernel/process/postmaster/autovacuum.cpp
index c0e79b263..c72cf3c24 100755
--- a/src/gausskernel/process/postmaster/autovacuum.cpp
+++ b/src/gausskernel/process/postmaster/autovacuum.cpp
@@ -1363,10 +1363,6 @@ NON_EXEC_STATIC void AutoVacWorkerMain()
         pgstat_report_appname("AutoVacWorker");
         pgstat_report_activity(STATE_IDLE, NULL);
 
-#if (!defined(ENABLE_MULTIPLE_NODES)) && (!defined(ENABLE_PRIVATEGAUSS))
-        LoadSqlPlugin();
-#endif
-
         set_ps_display(dbname, false);
         ereport(GetVacuumLogLevel(), (errmsg("start autovacuum on database \"%s\"", dbname)));
 
@@ -1391,6 +1387,9 @@ NON_EXEC_STATIC void AutoVacWorkerMain()
          */
         t_thrd.utils_cxt.CurrentResourceOwner = ResourceOwnerCreate(NULL, "AutoVacuumWorker",
             THREAD_GET_MEM_CXT_GROUP(MEMORY_CONTEXT_STORAGE));
+#if (!defined(ENABLE_MULTIPLE_NODES)) && (!defined(ENABLE_PRIVATEGAUSS))
+        LoadSqlPlugin();
+#endif
 
         oldcontext = MemoryContextSwitchTo(SESS_GET_MEM_CXT_GROUP(MEMORY_CONTEXT_STORAGE));
         if (u_sess->proc_cxt.MyProcPort->database_name)
diff --git a/src/gausskernel/process/tcop/postgres.cpp b/src/gausskernel/process/tcop/postgres.cpp
index de887cdf5..55adb4834 100755
--- a/src/gausskernel/process/tcop/postgres.cpp
+++ b/src/gausskernel/process/tcop/postgres.cpp
@@ -7686,7 +7686,12 @@ void RemoveTempNamespace()
 
 #if (!defined(ENABLE_MULTIPLE_NODES)) && (!defined(ENABLE_PRIVATEGAUSS))
 #define INITIAL_USER_ID 10
-/* IMPORTANT: load plugin should call after process is normal, cause heap_create_with_catalog will check it */
+/*
+ * IMPORTANT:
+ * 1. load plugin should call after process is normal, cause heap_create_with_catalog will check it.
+ * 2. load plugin should call after mask_password_mem_cxt is created, cause maskPassword is called
+ *      when create extension, which need mask_password_mem_cxt.
+ */
 void LoadSqlPlugin()
 {
     if (u_sess->proc_cxt.MyDatabaseId != InvalidOid && DB_IS_CMPT(B_FORMAT) && IsFileExisted(DOLPHIN)) {