diff --git a/vd960Loop/utilities/at32f421_freertos_demo/src/TaskLoop.c b/vd960Loop/utilities/at32f421_freertos_demo/src/TaskLoop.c
index 480de0c..784b83d 100644
--- a/vd960Loop/utilities/at32f421_freertos_demo/src/TaskLoop.c
+++ b/vd960Loop/utilities/at32f421_freertos_demo/src/TaskLoop.c
@@ -469,6 +469,9 @@ void vd1_task_per_channel(Loop154_Unit *unit)
 
             unit->loop_VD_FLAG = 1;
             unit->loop_FLAG_IN = 1;
+            if (unit->hold_time > 0) {
+                unit->loop_VD_HOLD = 1;
+            }
             at32_led_on(unit->loop_num);
 
             if (!unit->SET_SAFE) {