diff --git a/apps/wpm/models.py b/apps/wpm/models.py
index ee73e776..abc604b6 100644
--- a/apps/wpm/models.py
+++ b/apps/wpm/models.py
@@ -510,7 +510,7 @@ class Mlogb(BaseModel):
     
     @property
     def mlogbdefect(self):
-        return MlogbDefect.objects.filter(mlogb=self)
+        return self.mlogbdefect_set.all()
 
     def cal_count_pn_jgqbl(self, cal_mlog=False):
         mqs = MlogbDefect.get_defect_qs_from_mlogb(self, ftype="in")
diff --git a/apps/wpm/views.py b/apps/wpm/views.py
index b55651c3..bbf07ae5 100644
--- a/apps/wpm/views.py
+++ b/apps/wpm/views.py
@@ -765,6 +765,9 @@ class MlogbViewSet(CustomListModelMixin, CustomGenericViewSet):
     queryset = Mlogb.objects.all()
     serializer_class = MlogbDetailSerializer
     select_related_fields = ["material_out", "material_in", "test_user", "wm_in__defect"]
+    prefetch_related_fields = [
+        Prefetch("mlogbdefect_set", queryset=MlogbDefect.objects.select_related("defect")),
+    ]
     filterset_class = MlogbFilter
     ordering = ["create_time"]