diff --git a/apps/wpm/models.py b/apps/wpm/models.py
index cf57b70a..31337a0f 100644
--- a/apps/wpm/models.py
+++ b/apps/wpm/models.py
@@ -466,6 +466,8 @@ class Mlogbw(BaseModel):
     @classmethod
     def cal_count_notok(cls, mlogb: Mlog):
         from apps.qm.models import Defect
+        # 锁定mlogb以防止并发修改
+        mlogb = Mlogb.objects.select_for_update().get(pk=mlogb.pk)
         count = Mlogbw.objects.filter(mlogb=mlogb).count()
         if mlogb.material_in:
             mlogb.count_use = count