diff --git a/README.md b/README.md
index b1bf27a..cedc410 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@
         1.添加H2O2-RS计算算法
     V5
         1.添加传感器预热检查
+    V5.1
+        1.排液最后的默认排空管道时间修改成8秒
 
 ```
 
diff --git a/src/service/disfection_ctl/drain_liquid_service.cpp b/src/service/disfection_ctl/drain_liquid_service.cpp
index 171e7a5..85c0c7f 100644
--- a/src/service/disfection_ctl/drain_liquid_service.cpp
+++ b/src/service/disfection_ctl/drain_liquid_service.cpp
@@ -63,14 +63,14 @@ void DrainLiquidService::startDraining() {
     while (!thisThread.getExitFlag()) {
       int32_t nowvolume = m_deviceIoControlService->getDisinfectantVolume_g();
       logger->info("draining remain {} g", nowvolume);
-      if (!volumeReachZeroFlag && nowvolume == 0) {
+      if (!volumeReachZeroFlag && nowvolume <= 0) {
         volumeReachZeroTime = zsteady_clock().now();
         volumeReachZeroFlag = true;
       }
 
       if (volumeReachZeroFlag) {
-        logger->info("stopDraining after {} s", 30 - zsteady_clock().elapsedTimeS(volumeReachZeroTime));
-        if (zsteady_clock().elapsedTimeS(volumeReachZeroTime) > 30) {
+        logger->info("stopDraining after {} s", 8 - zsteady_clock().elapsedTimeS(volumeReachZeroTime));
+        if (zsteady_clock().elapsedTimeS(volumeReachZeroTime) > 8) {
           break;
         }
       }
diff --git a/src/version.hpp b/src/version.hpp
index 2f15e80..d67d9b6 100644
--- a/src/version.hpp
+++ b/src/version.hpp
@@ -1,2 +1,2 @@
 #pragma once
-#define VERSION "5.0"
\ No newline at end of file
+#define VERSION "5.1"
\ No newline at end of file