diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/GNSSCalcFilterService.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/GNSSCalcFilterService.java
index 06a94fd3..21c01332 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/GNSSCalcFilterService.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/GNSSCalcFilterService.java
@@ -33,6 +33,7 @@ public class GNSSCalcFilterService {
     static final float XY_THRESHOLD = 30; //水平异常点30mm
     static final float Z_THRESHOLD = 30; //高程异常点30mm
     static final float AUTO_THRESHOLD = 50; //触发自适应滤波的门限50mm
+    static final double MIN_CHANGE = 0.01;
 
     static class VaryFilterCycle{
         public LocalDateTime startTime;
@@ -116,6 +117,12 @@ public class GNSSCalcFilterService {
                 newRecord.setEnabled(false); //记录为坏点，下次不参与滤波
                 logger.info(deviceId + " abnormal gnss data");
             }
+            else if (Math.abs(newRecord.getB562e() - record0.getB562e()) < MIN_CHANGE &&
+                    Math.abs(newRecord.getB562n() - record0.getB562n()) < MIN_CHANGE &&
+                    Math.abs(newRecord.getB562d() - record0.getB562d()) < MIN_CHANGE) {
+                newRecord.setEnabled(false); //如果两次解算结果相等，数据有被冻住的嫌疑，记录为坏点，下次不参与滤波
+                logger.info(deviceId + " abnormal gnss data");
+            }
             else {
                 // 求本组和最近recordNum组原始值的平均值
                 double sumE = newRecord.getB562e();
@@ -166,20 +173,22 @@ public class GNSSCalcFilterService {
             LocalDateTime cmpTime = now.minusHours(groupCalc.getFilter_min_hour());
             QueryWrapper<GnssCalcData> queryWrapper = new QueryWrapper<>();
             queryWrapper.eq("deviceid", deviceId);
-            queryWrapper.ge("createtime",cmpTime.format(dateFormatter));
-            queryWrapper.last("limit 1");
-            GnssCalcData gnssCalcData = repository.selectOne(queryWrapper);
-            if(gnssCalcData != null && gnssCalcData.getEnabled()){
-                if(gnssCalcData.getRb562e()!=null && gnssCalcData.getRb562d()!=null){
+            queryWrapper.le("createtime",cmpTime.format(dateFormatter));
+            queryWrapper.last("limit 3");
+            queryWrapper.orderByDesc("createtime");
+            List<GnssCalcData> gnssCalcDataList = repository.selectList(queryWrapper);
+            for (GnssCalcData gnssCalcData:gnssCalcDataList) {
+                if (gnssCalcData.getEnabled() && gnssCalcData.getRb562e() != null) {
                     double gapE = Math.abs(gnssCalcData.getRb562e() - curCalcData.getRb562e());
                     double gapN = Math.abs(gnssCalcData.getRb562n() - curCalcData.getRb562n());
-                    if(gapE>=groupCalc.getAuto_threshold() || gapN>=groupCalc.getAuto_threshold()){
+                    if (gapE >= groupCalc.getAuto_threshold() || gapN >= groupCalc.getAuto_threshold()) {
                         VaryFilterCycle varyCycle1 = new VaryFilterCycle();
                         varyCycle1.startTime = now;
                         varyCycle1.filterCycleHour = groupCalc.getFilter_min_hour();
                         autoCycleDevices.put(deviceId, varyCycle1);
-                        logger.info(deviceId + ": filter cycle change to "+varyCycle1.filterCycleHour);
+                        logger.info(deviceId + ": filter cycle change to " + varyCycle1.filterCycleHour);
                     }
+                    break;
                 }
             }
         }