diff --git a/apps/ofm/models.py b/apps/ofm/models.py
index 6d5881cc..9fdb1517 100644
--- a/apps/ofm/models.py
+++ b/apps/ofm/models.py
@@ -67,7 +67,10 @@ class VehicleUse(CommonBDModel):
     ticket = models.ForeignKey('wf.ticket', verbose_name='关联工单',
                                on_delete=models.SET_NULL, related_name='vehicle_ticket', null=True, blank=True, db_constraint=False)
     def save(self, *args, **kwargs):
-        if self.end_km:
+        if self.start_km is not None:
+            self.start_km = int(self.start_km)
+        if self.end_km is not None:
+            self.end_km = int(self.end_km)
             if self.start_km <= self.end_km:
                 self.actual_km = self.end_km - self.start_km
                 with transaction.atomic():