diff --git a/contest/serializers.py b/contest/serializers.py
index c99c16dc..b886afed 100644
--- a/contest/serializers.py
+++ b/contest/serializers.py
@@ -25,7 +25,7 @@ class ContestSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = Contest
-
+        exclude = ('password', 'visible')
 
 class EditConetestSeriaizer(serializers.Serializer):
     id = serializers.IntegerField()
diff --git a/submission/views/oj.py b/submission/views/oj.py
index 028a733a..626b8c3b 100644
--- a/submission/views/oj.py
+++ b/submission/views/oj.py
@@ -89,52 +89,3 @@ class SubmissionListAPI(APIView):
         return self.success(data)
 
 
-def _get_submission(submission_id, user):
-    """
-    用户权限判断
-    """
-    submission = Submission.objects.get(id=submission_id)
-    # Super Admin / Owner / Share
-    if user.admin_type == AdminType.SUPER_ADMIN or submission.user_id == user.id:
-        return {"submission": submission, "can_share": True}
-    if submission.contest_id:
-        # 比赛部分
-        pass
-    if submission.shared:
-        return {"submission": submission, "can_share": False}
-    else:
-        raise Submission.DoesNotExist
-
-
-class SubmissionDetailAPI(APIView):
-    """
-    单个提交页面详情
-    """
-
-    def get(self, request, **kwargs):
-        try:
-            result = _get_submission(kwargs["submission_id"], request.user)
-            submission = result["submission"]
-        except Submission.DoesNotExist:
-            return self.error("Submission not exist")
-
-        # TODO: Contest
-        try:
-            if submission.contest_id:
-                # problem = ContestProblem.objects.get(id=submission.problem_id, visible=True)
-                pass
-            else:
-                problem = Problem.objects.get(id=submission.problem_id, visible=True)
-        except (Problem.DoesNotExist,):
-            return self.error("Submission not exist")
-
-        if submission.result in [JudgeStatus.COMPILE_ERROR, JudgeStatus.SYSTEM_ERROR, JudgeStatus.PENDING]:
-            info = submission.info
-        else:
-            info = submission.info
-            if "test_case" in info[0]:
-                info = sorted(info, key=lambda x: x["test_case"])
-
-        user = User.objects.get(id=submission.user_id)
-        return self.success({"submission": submission, "problem": problem, "info": info,
-                             "user": user, "can_share": result["can_share"]})
diff --git a/utils/api/_serializers.py b/utils/api/_serializers.py
index 4cfe3f4c..f841f036 100644
--- a/utils/api/_serializers.py
+++ b/utils/api/_serializers.py
@@ -4,7 +4,7 @@ from rest_framework import serializers
 
 class DateTimeTZField(serializers.DateTimeField):
     def to_representation(self, value):
-        self.format = "%Y-%-m-%d %H:%M:%S %Z"
+        # self.format = "%Y-%-m-%d %H:%M:%S %Z"
         value = timezone.localtime(value)
         return super(DateTimeTZField, self).to_representation(value)