diff --git a/qos_auth/auth_ctl/qos_ctrl.c b/qos_auth/auth_ctl/qos_ctrl.c
index 2304edf9b911ce788cc1e5ba5a35bca25c7a263c..73bc107f1d698b6b7f8ac7a39a85fe0251f259b6 100644
--- a/qos_auth/auth_ctl/qos_ctrl.c
+++ b/qos_auth/auth_ctl/qos_ctrl.c
@@ -256,6 +256,12 @@ int qos_apply(struct qos_ctrl_data *data)
 
 	qts = (struct qos_task_struct *) &p->qts;
 
+	if (rt_task(p) && qts->in_qos == NO_QOS) {
+		pr_err("[QOS_CTRL] can not apply qos for native rt task\n");
+		ret = -ALREADY_RT_TASK;
+		goto out_unlock;
+	}
+
 	/* effective qos must in range [NO_QOS, NR_QOS) */
 	if (qts->in_qos != NO_QOS) {
 		if (qts->in_qos == level) {
diff --git a/qos_auth/include/auth_ctrl.h b/qos_auth/include/auth_ctrl.h
index f2e04ee959666450efe3eece4a1e547df9c29178..7301cacc2d126c5e9723af698e6ffd0fed00e4b3 100644
--- a/qos_auth/include/auth_ctrl.h
+++ b/qos_auth/include/auth_ctrl.h
@@ -72,6 +72,7 @@ enum auth_err_no {
 	PID_DUPLICATE,
 	PID_NOT_EXIST,
 	INVALID_AUTH,
+	ALREADY_RT_TASK,
 	QOS_THREAD_NUM_EXCEED_LIMIT,
 };