diff --git a/platform-biz-patient-service/src/main/java/com/lyms/platform/biz/service/PatientsService.java b/platform-biz-patient-service/src/main/java/com/lyms/platform/biz/service/PatientsService.java
index 4f29353..9fcff7b 100644
--- a/platform-biz-patient-service/src/main/java/com/lyms/platform/biz/service/PatientsService.java
+++ b/platform-biz-patient-service/src/main/java/com/lyms/platform/biz/service/PatientsService.java
@@ -257,7 +257,9 @@ public class PatientsService {
                         sieveModel.setName(patients.getUsername());
                         sieveModel.setLastMenses(patients.getLastMenses());
                         sieveModel.setCardNo(patients.getCardNo());
-                        sieveModel.setDueWeek(days);
+                        if(null!= sieveModel.getDueWeek()) {
+                            sieveModel.setDueWeek(days);
+                        }
                         sieveDao.updateChanQianSieve(sieveModel);
                     }
                 }