diff --git a/src/main/java/com/iflytop/handacid/app/service/ChannelCtrlService.java b/src/main/java/com/iflytop/handacid/app/service/ChannelCtrlService.java
index a321614..00a6a7b 100644
--- a/src/main/java/com/iflytop/handacid/app/service/ChannelCtrlService.java
+++ b/src/main/java/com/iflytop/handacid/app/service/ChannelCtrlService.java
@@ -304,17 +304,20 @@ public class ChannelCtrlService {
             Formulation formulation = formulationService.getOne(new LambdaQueryWrapper<Formulation>().eq(Formulation::getSolutionId, channelState.getSolutionId())
                     .eq(Formulation::getConcentration, channelState.getConcentration()).eq(Formulation::getVolume, channelState.getTargetVolume()).last("limit 1"));
             double dispensedVolume = calculateActualSolutionDispensedVolume(channelState.getPumpPositionCache(), currentPosition, formulation);
-            double currentVolume = channelState.getCurrentVolume() - dispensedVolume;
-            BigDecimal bd = BigDecimal.valueOf(currentVolume);
-            double roundedCurrentVolume = bd.setScale(2, RoundingMode.HALF_UP).doubleValue();
+            double currentVolume = channelState.getCurrentVolume() - dispensedVolume;//剩余
             log.info("旧位置与新位置：{}，{}", channelState.getPumpPositionCache(), currentPosition);
             log.info("实际加液量：{}", dispensedVolume);
+            BigDecimal bd = BigDecimal.valueOf(currentVolume);
+            double roundedCurrentVolume = bd.setScale(2, RoundingMode.HALF_UP).doubleValue();//剩余保留2位
+            if(roundedCurrentVolume < 0){
+                roundedCurrentVolume = 0;
+            }
             channelState.setCurrentVolume(roundedCurrentVolume);
             Channel channel = channelService.getOne(new LambdaQueryWrapper<>(new Channel()).eq(Channel::getCode, channelState.getChannelCode()));
             channel.setCurrentVolume(roundedCurrentVolume);
             channelService.updateById(channel);
             AuditRecord auditRecord = new AuditRecord(deviceState.getCurrentUser().getId(), deviceState.getCurrentUser().getNickname(), channelState.getSolutionId(),
-                    channelState.getSolutionName(), formulation.getConcentration(), channelState.getChannelCode().name(), roundedCurrentVolume);
+                    channelState.getSolutionName(), formulation.getConcentration(), channelState.getChannelCode().name(), dispensedVolume);//记录审计
             auditRecordService.saveOrUpdate(auditRecord);
         }
     }
@@ -346,7 +349,8 @@ public class ChannelCtrlService {
             throw new IllegalArgumentException("Formulation.revolutions 不能为 0");
         }
         // 实际出液量 = 差值圈数 * (目标加液量 ÷ 目标圈数)
-        return deltaRevolutions * (targetVolume / targetRevs);
+        BigDecimal bd = BigDecimal.valueOf(deltaRevolutions * (targetVolume / targetRevs));
+        return bd.setScale(2, RoundingMode.HALF_UP).doubleValue();
     }