diff --git a/vd960Loop/utilities/at32f421_freertos_demo/src/TaskLoop.c b/vd960Loop/utilities/at32f421_freertos_demo/src/TaskLoop.c
index 784b83d..c0bbf49 100644
--- a/vd960Loop/utilities/at32f421_freertos_demo/src/TaskLoop.c
+++ b/vd960Loop/utilities/at32f421_freertos_demo/src/TaskLoop.c
@@ -292,20 +292,29 @@ void TMR15_GLOBAL_IRQHandler(void)
                     }
                 }
 
-                /* 有限存在超时 */
+                /* 有限存在超时 — 通道重启，重新建立基线 */
                 if (unit->loop_VD_HOLD) {
                     unit->Hold_CNT++;
                     if (unit->Hold_CNT > unit->hold_time) {
                         unit->loop_VD_HOLD = 0;
                         unit->Hold_CNT = 0;
-                        if (unit->loop_VD_FLAG) {
-                            set_loops_relay_off(unit->loop_num);
-                            unit->loop_VD_FLAG  = 0;
-                            unit->loop_FLAG_OUT = 1;
-                            unit->LC_HOLD  = 0;
-                            unit->loop_ORG_CNT = 0;
-                            unit->loop_ORG_SUM = 0;
-                        }
+                        set_loops_relay_off(unit->loop_num);
+                        unit->loop_VD_FLAG  = 0;
+                        unit->loop_FLAG_IN  = 0;
+                        unit->loop_FLAG_OUT = 0;
+                        unit->loop_FLAG_PLUSE = 0;
+                        unit->LC_HOLD  = 0;
+                        unit->LC_Reset = 1;
+                        unit->loop_INI_LOOP = 1;
+                        unit->loop_LOOP_OK0 = 0;
+                        unit->loop_stable   = 0;
+                        unit->loop_ORG_CNT  = 0;
+                        unit->loop_ORG_SUM  = 0;
+#if USE_FLATNESS_EXIT
+                        unit->exit_state    = 0;
+                        unit->max_slope     = 0;
+                        unit->max_slope_rate = 0;
+#endif
                     }
                 }