diff --git a/hb_server/apps/mtm/models.py b/hb_server/apps/mtm/models.py
index e3f77ed..20eae86 100644
--- a/hb_server/apps/mtm/models.py
+++ b/hb_server/apps/mtm/models.py
@@ -29,7 +29,7 @@ class Material(CommonAModel):
     specification = models.CharField('型号', max_length=100, null=True, blank=True)
     type = models.CharField('物料类型', choices= type_choices, max_length=20, default=1)
     sort_str = models.CharField('排序字符', max_length=100, null=True, blank=True)
-    processes = models.JSONField('工艺流程', default=list, blank=True)
+    processes = models.JSONField('工艺流程', default=list, null=True,blank=True)
     unit = models.CharField('基准计量单位', choices=unit_choices, default='块', max_length=10)
 
     class Meta: