diff --git a/apps/ofm/models.py b/apps/ofm/models.py
index 806ebb4d..9455783b 100644
--- a/apps/ofm/models.py
+++ b/apps/ofm/models.py
@@ -3,6 +3,7 @@ from apps.utils.models import CommonADModel, BaseModel, CommonBDModel
 from apps.system.models import User
 from django.core.validators import RegexValidator
 from datetime import datetime
+from rest_framework.exceptions import ParseError
 # Create your models here.
 
 
@@ -84,7 +85,10 @@ class Vehicle(CommonBDModel):
                                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:
-            self.actual_km = self.end_km - self.start_km
+            if self.start_km <= self.end_km:
+                self.actual_km = self.end_km - self.start_km
+            else:
+                raise ParseError('归还公里数不能小于出发公里数')
         else:
             self.actual_km = 0
         return super().save(*args, **kwargs)
diff --git a/apps/ofm/services.py b/apps/ofm/services.py
index b9093569..0cfad707 100644
--- a/apps/ofm/services.py
+++ b/apps/ofm/services.py
@@ -58,6 +58,11 @@ def bind_vehicle(ticket: Ticket, transition, new_ticket_data: dict):
         ins.save()
 
 
+# def update_vehicle_endkm(ticket: Ticket, transition, new_ticket_data: dict):
+#     ins = Vehicle.objects.get(id=new_ticket_data['t_id'])
+#     ins.end_km = new_ticket_data['end_km']
+#     ins.save()
+
 def bind_file(ticket: Ticket, transition, new_ticket_data: dict):
     ins = BorrowRecord.objects.get(id=new_ticket_data['t_id'])
     ticket_data = ticket.ticket_data