diff --git a/db_logic/medicament.py b/db_logic/medicament.py
index 64f836c..954d87e 100644
--- a/db_logic/medicament.py
+++ b/db_logic/medicament.py
@@ -378,7 +378,7 @@ class BllMedicament(Repository):
         self.session.merge(entityDrug)
 
         drug = BllMedicament().findEntity(entityDrug.medicament_id)
-        lastRemain = float(drug.remain)
+        lastRemain = float(drug.remain) if drug.remain else 0
 
         if entityClient.client_id  not in client_list:
             entityDrugRecord = EntityMedicamentRecord(
@@ -390,7 +390,7 @@ class BllMedicament(Repository):
                 price=float(entityDrug.price) if entityDrug.price else 0,
                 use_quantity=float(lastRemain) - float(entityDrug.remain if entityDrug.remain else 0),
                 record_type=DrugRecordType.Return,
-                record_remain=float(entityDrug.remain),
+                record_remain=float(entityDrug.remain) if entityDrug.remain else 0,
                 is_empty=1 if(entityDrug.status == DrugStatus.Empty) else 0,
                 create_date=Utils.get_str_datetime(),
                 create_user_id=entityUser.user_id,
@@ -414,7 +414,7 @@ class BllMedicament(Repository):
         self.session.merge(entityVariety)
 
         self.commitTrans()
-        remain_result = self.calculate_use_drug(drug, weight_remain=float(entityDrug.remain))
+        remain_result = self.calculate_use_drug(drug, weight_remain=float(entityDrug.remain if entityDrug.remain else 0))
         return remain_result
 
     # 药剂登记