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 bb3f9b75..06d90e18 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
@@ -108,6 +108,10 @@ public class GNSSCalcFilterService {
         query.orderByDesc("createtime");
 
         List<GnssCalcData> gnssDeviceLocationRecords = repository.selectList(query);
+        logger.info(deviceId + " select records from "+filterAfterTime.format(dateFormatter)+
+                " to "+newRecordTime.format(dateFormatter)+
+                ", record num:"+gnssDeviceLocationRecords.size());
+
         if(gnssDeviceLocationRecords.size() == 0){
             //第一个点无参考，当作坏点处理
             newRecord.setEnabled(false);