diff --git a/detection/src/main/java/com/njcn/gather/detection/service/impl/DetectionServiceImpl.java b/detection/src/main/java/com/njcn/gather/detection/service/impl/DetectionServiceImpl.java
index 725726fc..a0e68960 100644
--- a/detection/src/main/java/com/njcn/gather/detection/service/impl/DetectionServiceImpl.java
+++ b/detection/src/main/java/com/njcn/gather/detection/service/impl/DetectionServiceImpl.java
@@ -1080,11 +1080,13 @@ public class DetectionServiceImpl {
                                 BigDecimal.valueOf(1.0 / data * (channelData + errSysDtl.getMaxErrorValue())))
                         ).collect(Collectors.toList());
                 if (CollUtil.isNotEmpty(qualifiedList)) {
-                    Double a = qualifiedList.get(0) - (1.0 / data * (channelData - errSysDtl.getMaxErrorValue()));
-                    detectionData.setErrorData(BigDecimal.valueOf(Math.abs(a)));
+                    BigDecimal subtract = BigDecimal.valueOf(qualifiedList.get(0))
+                            .subtract(BigDecimal.valueOf(1.0 / data * (channelData - errSysDtl.getMaxErrorValue())));
+                    detectionData.setErrorData(subtract);
                 } else {
-                    Double a = list.get(0) - (1.0 / data * (channelData - errSysDtl.getMaxErrorValue()));
-                    detectionData.setErrorData(BigDecimal.valueOf(Math.abs(a)));
+                    BigDecimal subtract = BigDecimal.valueOf(list.get(0))
+                            .subtract(BigDecimal.valueOf(1.0 / data * (channelData - errSysDtl.getMaxErrorValue())));
+                    detectionData.setErrorData(subtract);
                 }
                 isData(dataRule, qualifiedList, detectionData, qualifiedList);
             }
@@ -1142,18 +1144,19 @@ public class DetectionServiceImpl {
      * @return
      */
     public BigDecimal devSubtractChannelData(Double devData, Double channelData, Integer errorValueType) {
-        if (devData - channelData != 0) {
+        BigDecimal subtract = BigDecimal.valueOf(devData).subtract(BigDecimal.valueOf(channelData));
+        if (subtract.doubleValue() != 0) {
             switch (errorValueType) {
                 case 2:
                     //下发的谐波电压幅值，返回的是谐波电压含有率，拿（含有率值*基波 - 源下发对应谐波值幅值）/下发的幅值
-                    return BigDecimal.valueOf(devData - channelData)
+                    return subtract
                             .divide(BigDecimal.valueOf(channelData), 4, RoundingMode.HALF_UP);
                 case 3:
                     //下发的谐波电压幅值，返回的是谐波电压含有率，拿（含有率值*基波 - 源下发对应谐波值幅值）/装置返回值
-                    return BigDecimal.valueOf(devData - channelData)
+                    return subtract
                             .divide(BigDecimal.valueOf(devData), 4, RoundingMode.HALF_UP);
             }
-            return BigDecimal.valueOf(devData - channelData);
+            return subtract;
         }
         return BigDecimal.valueOf(0);
     }