diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index fc7fa8e9..53d4daad 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -983,10 +983,18 @@ class MlogbwCreateUpdateSerializer(CustomModelSerializer):
             mlogbw = self.save_ftest(mlogbw, ftest_data)
         return mlogbw
 
+    @transaction.atomic
     def update(self, instance, validated_data):
+        old_number = instance.number
         validated_data.pop("mlogb")
         ftest_data = validated_data.pop("ftest", None)
         mlogbw:Mlogbw = super().update(instance, validated_data)
+        if (
+            mlogbw.number != old_number
+            and mlogbw.mlogb.material_out_id is not None
+            and mlogbw.wpr is not None
+        ):
+            mlogbw.wpr.change_number(mlogbw.number)
         if ftest_data:
             mlogbw = self.save_ftest(mlogbw, ftest_data)
         elif ftest_data is None:
diff --git a/apps/wpm/tests/test_mlogbw_number.py b/apps/wpm/tests/test_mlogbw_number.py
new file mode 100644
index 00000000..d6720918
--- /dev/null
+++ b/apps/wpm/tests/test_mlogbw_number.py
@@ -0,0 +1,80 @@
+from types import SimpleNamespace
+from unittest.mock import MagicMock, patch
+
+from django.test import SimpleTestCase
+
+from apps.wpm.serializers import MlogbwCreateUpdateSerializer
+from apps.wpmw.models import Wpr
+
+
+class MlogbwNumberUpdateTests(SimpleTestCase):
+    @staticmethod
+    def _apply_update(instance, validated_data):
+        instance.number = validated_data["number"]
+        return instance
+
+    @patch("apps.wpm.serializers.CustomModelSerializer.update")
+    def test_output_number_update_changes_linked_wpr_number(self, base_update):
+        base_update.side_effect = self._apply_update
+        wpr = MagicMock()
+        instance = SimpleNamespace(
+            number="OLD-001",
+            mlogb=SimpleNamespace(material_out_id="material-out"),
+            wpr=wpr,
+            ftest=None,
+        )
+
+        MlogbwCreateUpdateSerializer.update.__wrapped__(
+            MlogbwCreateUpdateSerializer(),
+            instance,
+            {"mlogb": instance.mlogb, "number": "NEW-001"},
+        )
+
+        wpr.change_number.assert_called_once_with("NEW-001")
+
+    @patch("apps.wpm.serializers.CustomModelSerializer.update")
+    def test_input_number_update_does_not_change_wpr_number(self, base_update):
+        base_update.side_effect = self._apply_update
+        wpr = MagicMock()
+        instance = SimpleNamespace(
+            number="OLD-001",
+            mlogb=SimpleNamespace(material_out_id=None),
+            wpr=wpr,
+            ftest=None,
+        )
+
+        MlogbwCreateUpdateSerializer.update.__wrapped__(
+            MlogbwCreateUpdateSerializer(),
+            instance,
+            {"mlogb": instance.mlogb, "number": "NEW-001"},
+        )
+
+        wpr.change_number.assert_not_called()
+
+    @patch("apps.wpmw.models.MIOItemw.objects.filter")
+    @patch("apps.wpmw.models.Handoverbw.objects.filter")
+    @patch("apps.wpmw.models.Mlogbw.objects.filter")
+    @patch("apps.wpmw.models.Wpr.objects.filter")
+    def test_wpr_number_change_updates_all_number_copies(
+        self,
+        wpr_filter,
+        mlogbw_filter,
+        handoverbw_filter,
+        mioitemw_filter,
+    ):
+        conflict_qs = MagicMock()
+        conflict_qs.exists.return_value = False
+        current_qs = MagicMock()
+        wpr_filter.side_effect = [conflict_qs, current_qs]
+        mlogbw_qs = mlogbw_filter.return_value
+        handoverbw_qs = handoverbw_filter.return_value
+        mioitemw_qs = mioitemw_filter.return_value
+        wpr = Wpr(id="wpr-id", number="OLD-001")
+
+        wpr.change_number("NEW-001")
+
+        current_qs.update.assert_called_once_with(number="NEW-001")
+        mlogbw_qs.update.assert_called_once_with(number="NEW-001")
+        handoverbw_qs.update.assert_called_once_with(number="NEW-001")
+        mioitemw_qs.update.assert_called_once_with(number="NEW-001")
+        self.assertEqual(wpr.number, "NEW-001")
diff --git a/apps/wpmw/models.py b/apps/wpmw/models.py
index a655e2e0..bc5832ba 100644
--- a/apps/wpmw/models.py
+++ b/apps/wpmw/models.py
@@ -33,6 +33,19 @@ class Wpr(BaseModel):
     data = models.JSONField(verbose_name="数据", default=dict, blank=True)
     pre_info = models.JSONField(verbose_name="预处理信息", default=dict, blank=True, null=True)
 
+    def change_number(self, new_number):
+        """修改产品编号，并同步所有保存了编号副本的关联明细。"""
+        if self.number == new_number:
+            return
+        if Wpr.objects.filter(number=new_number).exists():
+            raise ParseError("新编号已存在,不可使用")
+
+        Wpr.objects.filter(id=self.id).update(number=new_number)
+        Mlogbw.objects.filter(wpr=self).update(number=new_number)
+        Handoverbw.objects.filter(wpr=self).update(number=new_number)
+        MIOItemw.objects.filter(wpr=self).update(number=new_number)
+        self.number = new_number
+
     @classmethod
     def change_or_new(
         cls, wpr=None, number=None, mb=None, wm=None, old_mb=None,
diff --git a/apps/wpmw/views.py b/apps/wpmw/views.py
index 60c51b69..e72a989c 100644
--- a/apps/wpmw/views.py
+++ b/apps/wpmw/views.py
@@ -63,15 +63,8 @@ class WprViewSet(BulkUpdateModelMixin, CustomListModelMixin, CustomRetrieveModel
         vdata = sr.validated_data
         new_number = vdata["new_number"]
         old_number = vdata["old_number"]
-        if Wpr.objects.filter(number=new_number).exists():
-            raise ParseError("新编号已存在,不可使用")
         wpr = Wpr.objects.get(number=old_number)
-        from apps.wpm.models import Mlogbw, Handoverbw
-        from apps.inm.models import MIOItemw
-        Wpr.objects.filter(id=wpr.id).update(number=new_number)
-        Mlogbw.objects.filter(wpr=wpr).update(number=new_number)
-        Handoverbw.objects.filter(wpr=wpr).update(number=new_number)
-        MIOItemw.objects.filter(wpr=wpr).update(number=new_number)
+        wpr.change_number(new_number)
         return Response()
 
     @action(methods=["post"], detail=False, perms_map={"post": "*"}, serializer_class=WprNewSerializer)