diff --git a/apps/edu/serializers.py b/apps/edu/serializers.py
index a2f37c7a..566cb780 100644
--- a/apps/edu/serializers.py
+++ b/apps/edu/serializers.py
@@ -10,6 +10,7 @@ class QuestioncatSerializer(CustomModelSerializer):
         fields = '__all__'
 
 class QuestionSerializer(CustomModelSerializer):
+    questioncat_name = serializers.CharField(source="questioncat.name", read_only=True)
     class Meta:
         model = Question
         fields = '__all__'
@@ -51,7 +52,7 @@ class PaperSerializer(CustomModelSerializer):
         with transaction.atomic():
             paper = super().update(instance, validated_data)
             # 删除未有的数据
-            question_ids = [item["question"].id for item in detail]
+            question_ids = [item["question"] for item in detail]
             PaperQuestion.objects.filter(paper=paper).exclude(question__id__in=question_ids).delete()
             # 更新新数据
             for item in detail: