diff --git a/apps/ofm/migrations/0015_alter_vehicle_end_km.py b/apps/ofm/migrations/0015_alter_vehicle_end_km.py
new file mode 100644
index 00000000..53a1ecca
--- /dev/null
+++ b/apps/ofm/migrations/0015_alter_vehicle_end_km.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2025-09-28 06:15
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ofm', '0014_auto_20250928_1023'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='vehicle',
+            name='end_km',
+            field=models.PositiveIntegerField(blank=True, null=True, verbose_name='归还公里数'),
+        ),
+    ]
diff --git a/apps/ofm/models.py b/apps/ofm/models.py
index 7bf1c4dd..806ebb4d 100644
--- a/apps/ofm/models.py
+++ b/apps/ofm/models.py
@@ -76,15 +76,17 @@ class Vehicle(CommonBDModel):
     via = models.CharField('途经地点', null=True, blank=True, max_length=100)
     destination = models.CharField('到达地点', null=True, blank=True, max_length=100)
     start_km = models.PositiveIntegerField('出发公里数')
-    end_km = models.PositiveIntegerField('归还公里数')
+    end_km = models.PositiveIntegerField('归还公里数', null=True, blank=True)
     actual_km = models.PositiveIntegerField('实际行驶公里数', editable=False)
     is_city = models.BooleanField('是否市内用车', default=True)
     reason = models.CharField('用车事由', max_length=100)
     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 and self.start_km:
+        if self.end_km:
             self.actual_km = self.end_km - self.start_km
+        else:
+            self.actual_km = 0
         return super().save(*args, **kwargs)