diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/MultiLineGNSSCalcService.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/MultiLineGNSSCalcService.java
index 9331b0df..25938c4a 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/MultiLineGNSSCalcService.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/calc/MultiLineGNSSCalcService.java
@@ -38,13 +38,14 @@ public class MultiLineGNSSCalcService {
     public void calc(D342LocationMessage d342Message){
         // 如果时间跨度大于1分钟，或者不含d341，则计算平滑值
         String deviceId = d342Message.getId();
-        LocalDateTime msgTime = d342Message.getOriginalTime();
         LocalDateTime lastDate = deviceMap.get(deviceId);
+        LocalDateTime msgTime = d342Message.getOriginalTime();
         int d341Count = d342Message.getMessageList().size();
         if(msgTime!=null) logger.info("proc D342: "+msgTime+" D341 num: "+d341Count);
 
-        // 如果序号为0，则创建一条转发记录表
-        if(d342Message.getSeq() == 0 && d342Message.getProjectId()!=null){
+        // 如果序号为0（有可能丢失，改为lastDate==null），则创建一条转发记录表
+        //if(d342Message.getSeq() == 0 && d342Message.getProjectId()!=null){
+        if(lastDate == null && d342Message.getProjectId()!=null){
             createFwdReord(d342Message);
             // 产生继续补传通知
             beidouClient.onGnssUpload(deviceId,d342Message.getTenantId(), msgTime);
@@ -57,7 +58,7 @@ public class MultiLineGNSSCalcService {
         }
 
         if(lastDate != null){
-            if(d341Count == 0){
+            if(d341Count == 0){//补传结束指示
                 // 计算上轮结果
                 calcService.calSingleDone(deviceId, d342Message.getTenantId(),lastDate);
                 // 重算最近的
@@ -85,7 +86,7 @@ public class MultiLineGNSSCalcService {
 
         // 记录最新补传数据的时间
         if(d341Count>0) deviceMap.put(deviceId, msgTime);
-        else{
+        else if(deviceMap.get(deviceId)!=null){
             // 补传完成
             deviceMap.remove(deviceId);
             beidouClient.onGnssUploadComplete(deviceId,d342Message.getTenantId());