diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/service/GNSSDeviceLocationRecordServiceImpl.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/service/GNSSDeviceLocationRecordServiceImpl.java
index 03d03d98..cc3650fb 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/service/GNSSDeviceLocationRecordServiceImpl.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/service/GNSSDeviceLocationRecordServiceImpl.java
@@ -131,7 +131,7 @@ public class GNSSDeviceLocationRecordServiceImpl implements GNSSDeviceLocationRe
         List<GnssCalcData> gnssDeviceLocationRecords = repository.selectList(query);
 
         LocalDateTime newRecordTime = newRecord.getCreatetime();
-        LocalDateTime filterAfterTime = newRecordTime.plusHours(filterCycleHour);
+        LocalDateTime filterAfterTime = newRecordTime.minusHours(filterCycleHour);
         boolean hasCheck = false;
         if(gnssDeviceLocationRecords.size() > 0){
             // 求本组和最近recordNum组原始值的平均值
@@ -153,8 +153,8 @@ public class GNSSDeviceLocationRecordServiceImpl implements GNSSDeviceLocationRe
                         }
                         hasCheck = true;
                     }
-                    // 超过平滑周期的不参与平滑计算
-                    if(newRecordTime.isAfter(filterAfterTime)) break;
+                    // 如果记录超过平滑周期的不参与平滑计算
+                    if(record.getCreatetime().isBefore(filterAfterTime)) break;
                     if (record.getEnabled()) {//只选取好点参与滤波
                         sumE += record.getB562e();
                         sumN += record.getB562n();