diff --git a/apps/wpmw/views.py b/apps/wpmw/views.py
index 54def096..7ee0ae8c 100644
--- a/apps/wpmw/views.py
+++ b/apps/wpmw/views.py
@@ -16,7 +16,12 @@ class WprViewSet(CustomListModelMixin, CustomGenericViewSet):
     prefetch_related_fields = ["defects"]
     queryset = Wpr.objects.all()
     serializer_class = WprSerializer
-    filterset_fields = ["mb", "wm", "state", "material", "defects"]
+    filterset_fields = {
+        "mb": ["exact", "isnull"],
+        "wm": ["exact", "isnull"],
+        "state": ["exact"],
+        "defects": ["exact"]
+    }
     ordering = ["-create_time"]
     ordering_fields = ["number", "create_time", "update_time"]
     search_fields = ["number", "material__name", "material__model", "material__specification"]