diff --git a/apps/qm/views.py b/apps/qm/views.py
index 264cf9b3..a0bf76ae 100644
--- a/apps/qm/views.py
+++ b/apps/qm/views.py
@@ -65,6 +65,22 @@ class FtestViewSet(CustomModelViewSet):
     select_related_fields = ['test_user', 'check_user', 'ftest_work']
     filterset_fields = ['type', 'ftest_work']
 
+    def perform_create(self, serializer):
+        ins = super().perform_create(serializer)
+        if ins.ftest_work:
+            ins.ftest_work.count_sampling = Ftest.objects.filter(
+                ftest_work=ins.ftest_work).count()
+            ins.ftest_work.save()
+        return ins
+
+    def perform_destroy(self, instance):
+        ftest_work = instance.ftest_work
+        instance.delete()
+        if ftest_work:
+            instance.ftest_work.count_sampling = Ftest.objects.filter(
+                ftest_work=instance.ftest_work).count()
+            instance.ftest_work.save()
+
 
 class PtestViewSet(CustomModelViewSet):
     """