diff --git a/apps/inm/migrations/0006_alter_mio_number.py b/apps/inm/migrations/0006_alter_mio_number.py
new file mode 100644
index 00000000..908accc2
--- /dev/null
+++ b/apps/inm/migrations/0006_alter_mio_number.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2023-10-25 08:50
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('inm', '0005_materialbatcha_mioitema'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='mio',
+            name='number',
+            field=models.CharField(max_length=20, unique=True, verbose_name='编号'),
+        ),
+    ]
diff --git a/apps/inm/models.py b/apps/inm/models.py
index 2c62b5c1..a2167dbd 100644
--- a/apps/inm/models.py
+++ b/apps/inm/models.py
@@ -66,7 +66,7 @@ class MIO(CommonBDModel):
         (MIO_CREATE, '创建中'),
         (MIO_SUBMITED, '已提交')
     )
-    number = models.CharField('编号', max_length=20)
+    number = models.CharField('编号', max_length=20, unique=True)
     state = models.PositiveSmallIntegerField(
         '状态', choices=MIO_STATES, default=10, help_text=str(MIO_CREATE))
     type = models.CharField('出入库类型', max_length=10, default=MIO_TYPE_DO_OUT,