diff --git a/web/app/controllers/add_contest.php b/web/app/controllers/add_contest.php
index 9f98ee4..dc70f3c 100644
--- a/web/app/controllers/add_contest.php
+++ b/web/app/controllers/add_contest.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	requirePHPLib('form');
 	
 	if (!isSuperUser($myUser)) {
@@ -52,4 +56,4 @@
 	$time_form->printHTML();
 ?>
 </div>
-<?php echoUOJPageFooter() ?>
\ No newline at end of file
+<?php echoUOJPageFooter() ?>
diff --git a/web/app/controllers/announcements.php b/web/app/controllers/announcements.php
index 2646e99..057461b 100644
--- a/web/app/controllers/announcements.php
+++ b/web/app/controllers/announcements.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	requirePHPLib('form');
 	
 	function echoBlogCell($blog) {
diff --git a/web/app/controllers/blog_show.php b/web/app/controllers/blog_show.php
index 7fbfe1e..8e49669 100644
--- a/web/app/controllers/blog_show.php
+++ b/web/app/controllers/blog_show.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!validateUInt($_GET['id']) || !($blog = queryBlog($_GET['id']))) {
 		become404Page();
 	}
diff --git a/web/app/controllers/blogs.php b/web/app/controllers/blogs.php
index 85559cd..80603aa 100644
--- a/web/app/controllers/blogs.php
+++ b/web/app/controllers/blogs.php
@@ -1,5 +1,9 @@
 <?php
 	requirePHPLib('form');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	function echoBlogCell($blog) {
 		echo '<tr>';
diff --git a/web/app/controllers/contest_inside.php b/web/app/controllers/contest_inside.php
index 0d488b0..bb9c7b5 100644
--- a/web/app/controllers/contest_inside.php
+++ b/web/app/controllers/contest_inside.php
@@ -1,5 +1,9 @@
 <?php
 	requirePHPLib('form');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	if (!validateUInt($_GET['id']) || !($contest = queryContest($_GET['id']))) {
 		become404Page();
diff --git a/web/app/controllers/contest_manage.php b/web/app/controllers/contest_manage.php
index 64842dc..3176f65 100644
--- a/web/app/controllers/contest_manage.php
+++ b/web/app/controllers/contest_manage.php
@@ -1,6 +1,10 @@
 <?php
 	requirePHPLib('form');
-	
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!validateUInt($_GET['id']) || !($contest = queryContest($_GET['id']))) {
 		become404Page();
 	}
diff --git a/web/app/controllers/contest_members.php b/web/app/controllers/contest_members.php
index a54b6a1..eab9785 100644
--- a/web/app/controllers/contest_members.php
+++ b/web/app/controllers/contest_members.php
@@ -1,6 +1,10 @@
 <?php
 	requirePHPLib('form');
-	
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!validateUInt($_GET['id']) || !($contest = queryContest($_GET['id']))) {
 		become404Page();
 	}
diff --git a/web/app/controllers/contest_registration.php b/web/app/controllers/contest_registration.php
index f5a0820..462e5c1 100644
--- a/web/app/controllers/contest_registration.php
+++ b/web/app/controllers/contest_registration.php
@@ -1,11 +1,12 @@
 <?php
 	requirePHPLib('form');
+
 	if (!validateUInt($_GET['id']) || !($contest = queryContest($_GET['id']))) {
 		become404Page();
 	}
 	genMoreContestInfo($contest);
 	
-	if ($myUser == null) {
+	if (!Auth::check()) {
 		redirectToLogin();
 	} elseif (hasContestPermission($myUser, $contest) || hasRegistered($myUser, $contest) || $contest['cur_progress'] != CONTEST_NOT_STARTED) {
 		redirectTo('/contests');
diff --git a/web/app/controllers/contests.php b/web/app/controllers/contests.php
index a1a8e13..634f332 100644
--- a/web/app/controllers/contests.php
+++ b/web/app/controllers/contests.php
@@ -1,6 +1,10 @@
 <?php
 	requirePHPLib('form');
-	
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	$upcoming_contest_name = null;
 	$upcoming_contest_href = null;
 	$rest_second = 1000000;
diff --git a/web/app/controllers/download.php b/web/app/controllers/download.php
index 7d735fe..dc41382 100644
--- a/web/app/controllers/download.php
+++ b/web/app/controllers/download.php
@@ -1,5 +1,10 @@
 <?php
 	requirePHPLib('judger');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	switch ($_GET['type']) {
 		case 'problem':
 			if (!validateUInt($_GET['id']) || !($problem = queryProblemBrief($_GET['id']))) {
@@ -44,4 +49,4 @@
 	header("X-Sendfile: $file_name");
 	header("Content-type: $mimetype");
 	header("Content-Disposition: attachment; filename=$download_name");
-?>
\ No newline at end of file
+?>
diff --git a/web/app/controllers/faq.php b/web/app/controllers/faq.php
index b7a7c1e..6746ce9 100644
--- a/web/app/controllers/faq.php
+++ b/web/app/controllers/faq.php
@@ -1,7 +1,12 @@
 <?php
 	requireLib('shjs');
 	requireLib('mathjax');
-	echoUOJPageHeader(UOJLocale::get('help')) 
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
+	echoUOJPageHeader(UOJLocale::get('help'));
 ?>
 <article>
 	<header>
diff --git a/web/app/controllers/hack.php b/web/app/controllers/hack.php
index 7c54ab8..290c5bf 100644
--- a/web/app/controllers/hack.php
+++ b/web/app/controllers/hack.php
@@ -1,6 +1,10 @@
 <?php
 	requirePHPLib('form');
-	
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!validateUInt($_GET['id']) || !($hack = queryHack($_GET['id']))) {
 		become404Page();
 	}
diff --git a/web/app/controllers/hack_list.php b/web/app/controllers/hack_list.php
index 2d343b3..8f33e39 100644
--- a/web/app/controllers/hack_list.php
+++ b/web/app/controllers/hack_list.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	$conds = array();
 
 	$q_problem_id = isset($_GET['problem_id']) && validateUInt($_GET['problem_id']) ? $_GET['problem_id'] : null;
diff --git a/web/app/controllers/map_visualizer.php b/web/app/controllers/map_visualizer.php
index ee0a83b..6e00765 100644
--- a/web/app/controllers/map_visualizer.php
+++ b/web/app/controllers/map_visualizer.php
@@ -1,5 +1,9 @@
 <?php
 
+if (!Auth::check()) {
+	becomeMsgPage(UOJLocale::get('need login'));
+}
+
 $REQUIRE_LIB['shjs'] = "";
 $REQUIRE_LIB['dracula'] = "";
 $REQUIRE_LIB['base64'] = "";
@@ -129,4 +133,4 @@ echoUOJPageHeader("图可视化");
 </script>
 
 <?php
-echoUOJPageFooter();
\ No newline at end of file
+echoUOJPageFooter();
diff --git a/web/app/controllers/paste_post.php b/web/app/controllers/paste_post.php
index 565cd73..5b2ef12 100644
--- a/web/app/controllers/paste_post.php
+++ b/web/app/controllers/paste_post.php
@@ -2,8 +2,8 @@
 requirePHPLib('form');
 requirePHPLib('judger');
 
-if ($myUser == null) {
-	becomeMsgPage("请先登录!");
+if (!Auth::check()) {
+	becomeMsgPage(UOJLocale::get('need login'));
 }
 
 
@@ -34,4 +34,4 @@ $paste_form->succ_href = '/paste';
 $paste_form->runAtServer();
 echoUOJPageHeader("Paste!");
 $paste_form->printHTML();
-echoUOJPageFooter();
\ No newline at end of file
+echoUOJPageFooter();
diff --git a/web/app/controllers/paste_view.php b/web/app/controllers/paste_view.php
index 16b8f65..277fc09 100644
--- a/web/app/controllers/paste_view.php
+++ b/web/app/controllers/paste_view.php
@@ -1,5 +1,9 @@
 <?php
 
+if (!Auth::check()) {
+	becomeMsgPage(UOJLocale::get('need login'));
+}
+
 $paste_id = $_GET['rand_str_id'];
 
 $paste = DB::selectFirst("select * from pastes where `index` = '".DB::escape($paste_id)."'");
@@ -9,4 +13,4 @@ if (!$paste) {
 $REQUIRE_LIB['shjs'] = "";
 echoUOJPageHeader("Paste!");
 echoPasteContent($paste);
-echoUOJPageFooter();
\ No newline at end of file
+echoUOJPageFooter();
diff --git a/web/app/controllers/problem.php b/web/app/controllers/problem.php
index 525efce..f4d105c 100644
--- a/web/app/controllers/problem.php
+++ b/web/app/controllers/problem.php
@@ -1,7 +1,11 @@
 <?php
 	requirePHPLib('form');
-	requirePHPLib('judger');
-	
+	requirePHPLib('judger');	
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!validateUInt($_GET['id']) || !($problem = queryProblemBrief($_GET['id']))) {
 		become404Page();
 	}
diff --git a/web/app/controllers/problem_data_manage.php b/web/app/controllers/problem_data_manage.php
index 51bbd6f..4e780b9 100644
--- a/web/app/controllers/problem_data_manage.php
+++ b/web/app/controllers/problem_data_manage.php
@@ -2,6 +2,10 @@
 	requirePHPLib('form');
 	requirePHPLib('judger');
 	requirePHPLib('data');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	if (!validateUInt($_GET['id']) || !($problem = queryProblemBrief($_GET['id']))) {
 		become404Page();
diff --git a/web/app/controllers/problem_managers_manage.php b/web/app/controllers/problem_managers_manage.php
index 786d91f..f90f2da 100644
--- a/web/app/controllers/problem_managers_manage.php
+++ b/web/app/controllers/problem_managers_manage.php
@@ -1,5 +1,9 @@
 <?php
 	requirePHPLib('form');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	if (!validateUInt($_GET['id']) || !($problem = queryProblemBrief($_GET['id']))) {
 		become404Page();
diff --git a/web/app/controllers/problem_set.php b/web/app/controllers/problem_set.php
index cb10f95..f74875b 100644
--- a/web/app/controllers/problem_set.php
+++ b/web/app/controllers/problem_set.php
@@ -2,6 +2,10 @@
 	requirePHPLib('form');
 	requirePHPLib('judger');
 	requirePHPLib('data');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	if (isSuperUser($myUser)) {
 		$new_problem_form = new UOJForm('new_problem');
diff --git a/web/app/controllers/problem_statement_manage.php b/web/app/controllers/problem_statement_manage.php
index 37017a5..aae155f 100644
--- a/web/app/controllers/problem_statement_manage.php
+++ b/web/app/controllers/problem_statement_manage.php
@@ -1,6 +1,10 @@
 <?php
 	requirePHPLib('form');
-	
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!validateUInt($_GET['id']) || !($problem = queryProblemBrief($_GET['id']))) {
 		become404Page();
 	}
diff --git a/web/app/controllers/problem_statistics.php b/web/app/controllers/problem_statistics.php
index b97f1d7..f5bf8bf 100644
--- a/web/app/controllers/problem_statistics.php
+++ b/web/app/controllers/problem_statistics.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!validateUInt($_GET['id']) || !($problem = queryProblemBrief($_GET['id']))) {
 		become404Page();
 	}
diff --git a/web/app/controllers/ranklist.php b/web/app/controllers/ranklist.php
index 3c7a104..ce3b1fc 100644
--- a/web/app/controllers/ranklist.php
+++ b/web/app/controllers/ranklist.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	become404Page();
 ?>
 <?php echoUOJPageHeader('比赛排行榜') ?>
diff --git a/web/app/controllers/subdomain/blog/aboutme.php b/web/app/controllers/subdomain/blog/aboutme.php
index 5310231..57c2aee 100644
--- a/web/app/controllers/subdomain/blog/aboutme.php
+++ b/web/app/controllers/subdomain/blog/aboutme.php
@@ -1,4 +1,10 @@
-<?php requirePHPLib('form') ?>
+<?php
+    requirePHPLib('form');
+
+    if (!Auth::check()) {
+        becomeMsgPage(UOJLocale::get('need login'));
+    }
+?>
 <?php echoUOJPageHeader('关于我') ?>
 
 <?php if (UOJContext::user()['username'] != 'vfleaking'): ?>
diff --git a/web/app/controllers/subdomain/blog/archive.php b/web/app/controllers/subdomain/blog/archive.php
index 593323c..59dc6ac 100644
--- a/web/app/controllers/subdomain/blog/archive.php
+++ b/web/app/controllers/subdomain/blog/archive.php
@@ -1,5 +1,9 @@
 <?php
 	requirePHPLib('form');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	$blogs_cond = "poster = '".UOJContext::userid()."' and is_draft = false";
 	if (!UOJContext::hasBlogPermission()) {
diff --git a/web/app/controllers/subdomain/blog/blog.php b/web/app/controllers/subdomain/blog/blog.php
index b0bf254..28fc66e 100644
--- a/web/app/controllers/subdomain/blog/blog.php
+++ b/web/app/controllers/subdomain/blog/blog.php
@@ -1,6 +1,10 @@
 <?php
 	requirePHPLib('form');
-	
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!isset($_GET['id']) || !validateUInt($_GET['id']) || !($blog = queryBlog($_GET['id'])) || !UOJContext::isHis($blog)) {
 		become404Page();
 	}
diff --git a/web/app/controllers/subdomain/blog/blog_delete.php b/web/app/controllers/subdomain/blog/blog_delete.php
index 81be35e..61c96bd 100644
--- a/web/app/controllers/subdomain/blog/blog_delete.php
+++ b/web/app/controllers/subdomain/blog/blog_delete.php
@@ -1,5 +1,9 @@
 <?php
 	requirePHPLib('form');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	if (!UOJContext::hasBlogPermission()) {
 		become403Page();
diff --git a/web/app/controllers/subdomain/blog/blog_write.php b/web/app/controllers/subdomain/blog/blog_write.php
index 4619945..57bdd2b 100644
--- a/web/app/controllers/subdomain/blog/blog_write.php
+++ b/web/app/controllers/subdomain/blog/blog_write.php
@@ -1,6 +1,10 @@
 <?php
 	requirePHPLib('form');
-	
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	if (!UOJContext::hasBlogPermission()) {
 		become403Page();
 	}
diff --git a/web/app/controllers/subdomain/blog/index.php b/web/app/controllers/subdomain/blog/index.php
index c9d6caf..b33e993 100644
--- a/web/app/controllers/subdomain/blog/index.php
+++ b/web/app/controllers/subdomain/blog/index.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	$blogs_pag = new Paginator(array(
 		'col_names' => array('*'),
 		'table_name' => 'blogs',
diff --git a/web/app/controllers/subdomain/blog/slide.php b/web/app/controllers/subdomain/blog/slide.php
index f3ad95e..7872d68 100644
--- a/web/app/controllers/subdomain/blog/slide.php
+++ b/web/app/controllers/subdomain/blog/slide.php
@@ -1,5 +1,9 @@
 <?php
 	requirePHPLib('form');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	if (!isset($_GET['id']) || !validateUInt($_GET['id']) || !($blog = queryBlog($_GET['id'])) || !UOJContext::isHisSlide($blog)) {
 		become404Page();
diff --git a/web/app/controllers/subdomain/blog/slide_write.php b/web/app/controllers/subdomain/blog/slide_write.php
index 09144da..34bec82 100644
--- a/web/app/controllers/subdomain/blog/slide_write.php
+++ b/web/app/controllers/subdomain/blog/slide_write.php
@@ -1,5 +1,9 @@
 <?php
 	requirePHPLib('form');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	if (!UOJContext::hasBlogPermission()) {
 		become403Page();
diff --git a/web/app/controllers/submission.php b/web/app/controllers/submission.php
index 535e4a8..bf14345 100644
--- a/web/app/controllers/submission.php
+++ b/web/app/controllers/submission.php
@@ -1,6 +1,10 @@
 <?php
 	requirePHPLib('form');
 	requirePHPLib('judger');
+
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
 	
 	if (!validateUInt($_GET['id']) || !($submission = querySubmission($_GET['id']))) {
 		become404Page();
diff --git a/web/app/controllers/submission_status_details.php b/web/app/controllers/submission_status_details.php
index 407bbab..2b2a2da 100644
--- a/web/app/controllers/submission_status_details.php
+++ b/web/app/controllers/submission_status_details.php
@@ -1,7 +1,7 @@
 <?php
 
 if (!Auth::check()) {
-	become403Page();
+	becomeMsgPage(UOJLocale::get('need login'));
 }
 
 if (!is_array($_GET['get'])) {
diff --git a/web/app/controllers/submissions_list.php b/web/app/controllers/submissions_list.php
index a04b2a1..e43acef 100644
--- a/web/app/controllers/submissions_list.php
+++ b/web/app/controllers/submissions_list.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	$conds = array();
 	
 	$q_problem_id = isset($_GET['problem_id']) && validateUInt($_GET['problem_id']) ? $_GET['problem_id'] : null;
diff --git a/web/app/controllers/user_info.php b/web/app/controllers/user_info.php
index dd4b67f..451fc67 100644
--- a/web/app/controllers/user_info.php
+++ b/web/app/controllers/user_info.php
@@ -1,4 +1,8 @@
 <?php
+	if (!Auth::check()) {
+		becomeMsgPage(UOJLocale::get('need login'));
+	}
+
 	$username = $_GET['username'];
 ?>
 <?php if (validateUsername($username) && ($user = queryUser($username))): ?>
diff --git a/web/app/controllers/user_msg.php b/web/app/controllers/user_msg.php
index 4513cbb..a714bb9 100644
--- a/web/app/controllers/user_msg.php
+++ b/web/app/controllers/user_msg.php
@@ -1,5 +1,5 @@
 <?php
-	if ($myUser == null) {
+	if (!Auth::check()) {
 		redirectToLogin();
 	}
 
diff --git a/web/app/controllers/user_system_msg.php b/web/app/controllers/user_system_msg.php
index 2242861..78dfaaf 100644
--- a/web/app/controllers/user_system_msg.php
+++ b/web/app/controllers/user_system_msg.php
@@ -1,5 +1,5 @@
 <?php
-	if ($myUser == null) {
+	if (!Auth::check()) {
 		redirectToLogin();
 	}
 	
diff --git a/web/app/locale/basic/en.php b/web/app/locale/basic/en.php
index 699c2b5..582a1d6 100644
--- a/web/app/locale/basic/en.php
+++ b/web/app/locale/basic/en.php
@@ -4,6 +4,7 @@ return [
 	'login' => 'Login',
 	'register' => 'Register',
 	'logout' => 'Logout',
+	'need login' => 'You need to login first',
 	'my profile' => 'My Profile',
 	'private message' => 'Private Message',
 	'system message' => 'System Message',
diff --git a/web/app/locale/basic/zh-cn.php b/web/app/locale/basic/zh-cn.php
index 64f5e0d..7c8ce30 100644
--- a/web/app/locale/basic/zh-cn.php
+++ b/web/app/locale/basic/zh-cn.php
@@ -4,6 +4,7 @@ return [
 	'login' => '登录',
 	'register' => '注册',
 	'logout' => '登出',
+	'need login' => '您需要登录后才能继续',
 	'my profile' => '个人信息',
 	'private message' => '私信',
 	'system message' => '系统消息',