diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 9c0ef4e4..c654ee8e 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -970,6 +970,9 @@ class HandoverSerializer(CustomModelSerializer):
             recive_mgroup = attrs.get("recive_mgroup", None)
             if recive_mgroup is None:
                 raise ParseError('返工交接需指定工段')
+        material:Material = attrs["material"]
+        if material.tracking == Material.MA_TRACKING_SINGLE:
+            attrs["count"] = len(attrs["handoverb"])
         return attrs
 
     class Meta: