diff --git a/apps/qm/migrations/0045_alter_defect_code.py b/apps/qm/migrations/0045_alter_defect_code.py
new file mode 100644
index 00000000..971cc386
--- /dev/null
+++ b/apps/qm/migrations/0045_alter_defect_code.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2025-02-28 01:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('qm', '0044_testitem_cd_expr'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='defect',
+            name='code',
+            field=models.CharField(blank=True, max_length=50, null=True, verbose_name='标识'),
+        ),
+    ]
diff --git a/apps/qm/models.py b/apps/qm/models.py
index f15e433d..cdaf2701 100644
--- a/apps/qm/models.py
+++ b/apps/qm/models.py
@@ -15,7 +15,7 @@ class Defect(CommonAModel):
     DEFECT_OK_B  = 20
     DEFECT_NOTOK = 30
     name = models.CharField(max_length=50, verbose_name="名称")
-    code = models.CharField(max_length=50, verbose_name="标识")
+    code = models.CharField(max_length=50, verbose_name="标识", null=True, blank=True)
     cate = models.CharField(max_length=50, verbose_name="分类", choices=(("尺寸", "尺寸"), ("外观", "外观"), ("内质", "内质")))
     okcate= models.PositiveSmallIntegerField(verbose_name="不合格分类", 
                                                choices=((DEFECT_OK, "合格"), (DEFECT_OK_B, "合格B类"), (DEFECT_NOTOK, "不合格")),