diff --git a/account/decorators.py b/account/decorators.py
index 33634e55..4113dd01 100644
--- a/account/decorators.py
+++ b/account/decorators.py
@@ -1,6 +1,6 @@
 # coding=utf-8
 from functools import wraps
-from django.http import HttpResponse
+from django.http import HttpResponse, HttpResponseRedirect
 from django.shortcuts import render
 
 from utils.shortcuts import error_response, error_page
@@ -18,7 +18,7 @@ def login_required(func):
         if request.is_ajax():
             return error_response(u"请先登录")
         else:
-            return error_page(request, u"请先登录")
+            return HttpResponseRedirect("/login/")
     return check
 
 
@@ -31,5 +31,5 @@ def admin_required(func):
         if request.is_ajax():
             return error_response(u"需要管理员权限")
         else:
-            return error_page(request, u"需要管理员权限")
+            return error_page(request, u"需要管理员权限，如果没有登录，请先登录")
     return check
diff --git a/account/test_urls.py b/account/test_urls.py
index 9757d901..5d2bdccf 100644
--- a/account/test_urls.py
+++ b/account/test_urls.py
@@ -1,5 +1,6 @@
 # coding=utf-8
 from django.conf.urls import include, url
+from django.views.generic import TemplateView
 
 from .tests import (LoginRequiredCBVTestWithArgs, LoginRequiredCBVTestWithoutArgs,
                     AdminRequiredCBVTestWithArgs, AdminRequiredCBVTestWithoutArgs)
@@ -15,4 +16,5 @@ urlpatterns = [
     url(r'^admin_required_test/fbv/(?P<problem_id>\d+)/$', "account.tests.admin_required_FBC_test_with_args"),
     url(r'^admin_required_test/cbv/1/$', AdminRequiredCBVTestWithoutArgs.as_view()),
     url(r'^admin_required_test/cbv/(?P<problem_id>\d+)/$', AdminRequiredCBVTestWithArgs.as_view()),
+    url(r'^login/$', TemplateView.as_view(template_name="oj/account/login.html"), name="user_login_page"),
 ]
diff --git a/account/tests.py b/account/tests.py
index a84911c0..0b7a8bba 100644
--- a/account/tests.py
+++ b/account/tests.py
@@ -260,7 +260,7 @@ class LoginRequiredDecoratorTest(TestCase):
     def test_fbv_without_args(self):
         # 没登陆
         response = self.client.get("/login_required_test/fbv/1/")
-        self.assertTemplateUsed(response, "utils/error.html")
+        self.assertRedirects(response, "/login/")
 
         # 登陆后
         self.client.login(username="test", password="test")
@@ -270,7 +270,7 @@ class LoginRequiredDecoratorTest(TestCase):
     def test_fbv_with_args(self):
         # 没登陆
         response = self.client.get("/login_required_test/fbv/1024/")
-        self.assertTemplateUsed(response, "utils/error.html")
+        self.assertRedirects(response, "/login/")
 
         # 登陆后
         self.client.login(username="test", password="test")
@@ -353,7 +353,7 @@ class AdminRequiredDecoratorTest(TestCase):
     def test_cbv_without_args(self):
         # 没登陆
         response = self.client.get("/admin_required_test/cbv/1/")
-        self.assertTemplateUsed(response, "utils/error.html")
+        self.assertRedirects(response, "/login/")
 
         # 登陆后
         self.client.login(username="test", password="test")
diff --git a/contest/decorators.py b/contest/decorators.py
index 06a8b703..0b25759f 100644
--- a/contest/decorators.py
+++ b/contest/decorators.py
@@ -1,7 +1,7 @@
 # coding=utf-8
 from functools import wraps
 
-from django.http import HttpResponse
+from django.http import HttpResponse, HttpResponseRedirect
 from django.shortcuts import render
 from django.utils.timezone import now
 
@@ -30,7 +30,7 @@ def check_user_contest_permission(func):
             if request.is_ajax():
                 return error_response(u"请先登录")
             else:
-                return error_page(request, u"请先登录")
+                return HttpResponseRedirect("/login/")
 
         # kwargs 就包含了url 里面的播或参数
         if "contest_id" in kwargs:
diff --git a/contest/views.py b/contest/views.py
index ae288cc3..42ecd62e 100644
--- a/contest/views.py
+++ b/contest/views.py
@@ -17,7 +17,7 @@ from account.decorators import login_required
 from group.models import Group
 from announcement.models import Announcement
 
-from .models import Contest, ContestProblem
+from .models import Contest, ContestProblem, ContestSubmission
 from .decorators import check_user_contest_permission
 from .serializers import (CreateContestSerializer, ContestSerializer, EditContestSerializer,
                           CreateContestProblemSerializer, ContestProblemSerializer,
@@ -263,17 +263,25 @@ def contest_page(request, contest_id):
     return render(request, "oj/contest/contest_index.html", {"contest": contest})
 
 
+@check_user_contest_permission
 def contest_problem_page(request, contest_id, contest_problem_id):
     try:
-        Contest.objects.get(id=contest_id)
+        contest = Contest.objects.get(id=contest_id)
     except Contest.DoesNotExist:
         return error_page(request, u"比赛不存在")
     try:
         contest_problem = ContestProblem.objects.get(id=contest_problem_id, visible=True)
     except ContestProblem.DoesNotExist:
         return error_page(request, u"比赛题目不存在")
+    show_warning = False
+    try:
+        submission = ContestSubmission.objects.get(user=request.user, contest=contest, problem=contest_problem)
+        show_warning = submission.ac
+    except ContestSubmission.DoesNotExist:
+        pass
     return render(request, "oj/contest/contest_problem.html", {"contest_problem": contest_problem,
-                                                               "samples": json.loads(contest_problem.samples)})
+                                                               "samples": json.loads(contest_problem.samples),
+                                                               "show_warning": show_warning})
 
 
 @check_user_contest_permission
diff --git a/static/src/js/app/oj/account/login.js b/static/src/js/app/oj/account/login.js
index bc95cf5b..0a057627 100644
--- a/static/src/js/app/oj/account/login.js
+++ b/static/src/js/app/oj/account/login.js
@@ -14,8 +14,15 @@ require(["jquery", "bsAlert", "csrfToken", "validator"], function ($, bsAlert, c
                         //成功登陆
                         var ref = document.referrer;
                         if(ref){
-                            if(ref.split("/")[2] == location.hostname){
+                            // 注册页和本页的来源的跳转回首页，防止死循环
+                            if(ref.indexOf("register") > -1 || ref.indexOf("login") > -1){
+                                location.href = "/";
+                                return;
+                            }
+                            // 判断来源，只有同域下才跳转
+                            if(ref.split("/")[2].split(":")[0] == location.hostname){
                                 location.href = ref;
+                                return;
                             }
                         }
                         location.href = "/";
diff --git a/submission/views.py b/submission/views.py
index eb4a3bb7..6399e22b 100644
--- a/submission/views.py
+++ b/submission/views.py
@@ -93,8 +93,7 @@ def contest_problem_my_submissions_list_page(request, contest_id, contest_proble
         contest_problem = ContestProblem.objects.get(id=contest_problem_id, visible=True)
     except Problem.DoesNotExist:
         return error_page(request, u"比赛问题不存在")
-    submissions = Submission.objects.filter(user_id=request.user.id, problem_id=contest_problem.id).order_by(
-        "-create_time"). \
+    submissions = Submission.objects.filter(user_id=request.user.id, problem_id=contest_problem.id).order_by("-create_time"). \
         values("id", "result", "create_time", "accepted_answer_time", "language")
     return render(request, "oj/contest/my_submissions_list.html",
                   {"submissions": submissions, "contest_problem": contest_problem})
@@ -160,7 +159,7 @@ def my_submission_list_page(request, page=1):
 
 
 class ContestSubmissionAPIView(APIView):
-    # @check_user_contest_permission
+    @check_user_contest_permission
     def post(self, request):
         """
         创建比赛的提交
diff --git a/template/oj/contest/contest_problem.html b/template/oj/contest/contest_problem.html
index 69991adb..32b0617a 100644
--- a/template/oj/contest/contest_problem.html
+++ b/template/oj/contest/contest_problem.html
@@ -81,6 +81,7 @@
             <textarea id="code-editor"></textarea>
         </div>
         <hr>
+
         <div id="submit-code">
             <button type="button" class="btn btn-primary" id="submit-code-button">
                 提交代码
@@ -88,6 +89,9 @@
             <img src="/static/img/loading.gif" id="loading-gif">
 
         </div>
+    {% if show_warning %}
+        <div class="alert alert-success" role="alert">您已经提交过本题的正确答案了！</div>
+    {% endif %}
 
         <div id="result">
         </div>
diff --git a/template/oj/contest/contest_problems_list.html b/template/oj/contest/contest_problems_list.html
index 1b40095c..23cefd71 100644
--- a/template/oj/contest/contest_problems_list.html
+++ b/template/oj/contest/contest_problems_list.html
@@ -21,8 +21,6 @@
                         <a href="/contest/{{ contest.id }}/rank/">排名</a>
                     </li>
                 </ul>
-
-
             </div>
 
             <div class="col-lg-9">
@@ -40,11 +38,14 @@
                         <tbody>
                         {% for item in contest_problems %}
                             <tr>
-                                <th><span class="glyphicon glyphicon-ok ac-flag"></span></th>
-                                <th scope="row"><a
-                                        href="/contest/{{ item.contest.id }}/problem/{{ item.id }}/">{{ item.sort_index }}</a>
+                                <th>
+                                    <span class="glyphicon glyphicon-ok ac-flag"></span>
                                 </th>
-                                <td><a href="/contest/{{ item.contest.id }}/problem/{{ item.id }}/">{{ item.title }}</a>
+                                <th scope="row">
+                                    <a href="/contest/{{ item.contest.id }}/problem/{{ item.id }}/" target="_blank">{{ item.sort_index }}</a>
+                                </th>
+                                <td>
+                                    <a href="/contest/{{ item.contest.id }}/problem/{{ item.id }}/" target="_blank">{{ item.title }}</a>
                                 </td>
                                 <td>{{ item|accepted_radio }}</td>
                             </tr>
diff --git a/template/oj/contest/problems.html b/template/oj/contest/problems.html
deleted file mode 100644
index 0f4e49e7..00000000
--- a/template/oj/contest/problems.html
+++ /dev/null
@@ -1,15 +0,0 @@
-{% extends "oj_base.html" %}
-{% block body %}
-    <div class="container main">
-        <ul class="nav nav-tabs nav-tabs-google">
-            <li role="presentation" class="active">
-                <a href="problem.html">题目</a></li>
-            <li role="presentation"><a href="my_solutions_list.html">我的提交</a></li>
-            <li role="presentation"><a href="#">排名</a></li>
-        </ul>
-        <h2 class="text-center">第一次比赛</h2>
-
-        <p class="text-muted text-center"><b>开始时间:</b> 2015-6-8 19:00 <b>结束时间:</b> 2015-9-1 12:00</p>
-
-    </div>
-{% endblock %}
\ No newline at end of file
diff --git a/template/oj/problem/problem_list.html b/template/oj/problem/problem_list.html
index 6c106e9a..a26ae80b 100644
--- a/template/oj/problem/problem_list.html
+++ b/template/oj/problem/problem_list.html
@@ -22,15 +22,15 @@
                             <th>#</th>
                             <th>题目</th>
                             <th><a href="/problems/?order_by=difficulty">难度</a></th>
-                            <th><a href="/problems/?order_by=aceptance">通过率</a></th>
+                            <th><a href="/problems/?order_by=acceptance">通过率</a></th>
                         </tr>
                         </thead>
                         <tbody>
                         {% for item in problems %}
                             <tr>
                                 <th><span class="glyphicon glyphicon-ok ac-flag"></span></th>
-                                <th scope="row"><a href="/problem/{{ item.id }}/">{{ item.id }}</a></th>
-                                <td><a href="/problem/{{ item.id }}/">{{ item.title }}</a></td>
+                                <th scope="row"><a href="/problem/{{ item.id }}/" target="_blank">{{ item.id }}</a></th>
+                                <td><a href="/problem/{{ item.id }}/" target="_blank">{{ item.title }}</a></td>
                                 <td>{{ item.difficulty }}</td>
                                 <td>{{ item|accepted_radio }}</td>
                             </tr>