diff --git a/apps/edu/serializers.py b/apps/edu/serializers.py
index a22fb967..7950f4ef 100644
--- a/apps/edu/serializers.py
+++ b/apps/edu/serializers.py
@@ -87,6 +87,14 @@ class ExamSerializer(CustomModelSerializer):
             validated_data.pop("paper", None)
         return super().update(instance, validated_data)
 
+class ExamDetailSerializer(CustomModelSerializer):
+    paper_ = PaperSerializer(source='paper')
+
+    class Meta:
+        model = Exam
+        fields = "__all__"
+        read_only_fields = EXCLUDE_FIELDS
+
 
 
 class AnswerDetailOutSerializer(CustomModelSerializer):
diff --git a/apps/edu/views.py b/apps/edu/views.py
index 8a3ccf78..00e47a33 100644
--- a/apps/edu/views.py
+++ b/apps/edu/views.py
@@ -8,7 +8,7 @@ from django.db import transaction
 from .models import Questioncat, Question, Paper, PaperQuestion, Exam, ExamRecord, AnswerDetail
 from .serializers import (QuestioncatSerializer, QuestionSerializer, ExamSerializer, 
                           ExamRecordInitSerizlier, ExamRecordSerializer, ExamRecordDetailSerializer, ExamRecordSubmitSerializer,
-                          PaperSerializer, PaperListSerializer, PaperPatchSerializer)
+                          PaperSerializer, PaperListSerializer, PaperPatchSerializer, ExamDetailSerializer)
 from django.utils import timezone
 from rest_framework.response import Response
 from rest_framework.permissions import IsAuthenticated
@@ -51,13 +51,14 @@ class ExamViewSet(CustomModelViewSet):
     queryset = Exam.objects.all()
     serializer_class = ExamSerializer
     filterset_class = ExamFilter
+    retrieve_serializer_class = ExamDetailSerializer
 
     def get_queryset(self):
         qs = super().get_queryset()
         if has_perm(self.request.user, 'exam.view'):
             return qs
         user:User = self.request.user
-        dept = user.belong_dept
+        dept = user.belong_dept if user else None
         qs = qs.filter(is_public=True)
         qs = qs|qs.filter(p_users=user)
         if dept:
@@ -71,7 +72,7 @@ class ExamViewSet(CustomModelViewSet):
         return super().destroy(request, *args, **kwargs)
     
     @swagger_auto_schema(request_body=Serializer, responses={200: ExamRecordInitSerizlier})
-    @action(methods=['post'], detail=True, perms_map=[{'post': '*'}], serializer_class=Serializer)
+    @action(methods=['post'], detail=True, perms_map={'post': '*'}, serializer_class=Serializer)
     def attend(self, request, *args, **kwargs):
         """
         参加考试
@@ -129,7 +130,7 @@ class ExamRecordViewSet(ListModelMixin, DestroyModelMixin, RetrieveModelMixin, C
 
     
     @swagger_auto_schema(request_body=ExamRecordSubmitSerializer, responses={200: ExamRecordSerializer})
-    @action(methods=['post'], detail=True, perms_map=[{'post': '*'}], serializer_class=ExamRecordSubmitSerializer, permission_classes = [IsAuthenticated])
+    @action(methods=['post'], detail=True, perms_map={'post': '*'}, serializer_class=ExamRecordSubmitSerializer, permission_classes = [IsAuthenticated])
     @transaction.atomic
     def submit(self, request, pk=None):
         '''