diff --git a/app/Caches/CourseCategoryList.php b/app/Caches/CourseCategoryList.php
deleted file mode 100644
index 12681a06..00000000
--- a/app/Caches/CourseCategoryList.php
+++ /dev/null
@@ -1,59 +0,0 @@
-<?php
-/**
- * @copyright Copyright (c) 2021 深圳市酷瓜软件有限公司
- * @license https://opensource.org/licenses/GPL-2.0
- * @link https://www.koogua.com
- */
-
-namespace App\Caches;
-
-use App\Models\Category as CategoryModel;
-use App\Repos\Course as CourseRepo;
-
-class CourseCategoryList extends Cache
-{
-
-    protected $lifetime = 86400;
-
-    public function getLifetime()
-    {
-        return $this->lifetime;
-    }
-
-    public function getKey($id = null)
-    {
-        return "course_category_list:{$id}";
-    }
-
-    public function getContent($id = null)
-    {
-        $courseRepo = new CourseRepo();
-
-        $categories = $courseRepo->findCategories($id);
-
-        if ($categories->count() == 0) {
-            return [];
-        }
-
-        return $this->handleContent($categories);
-    }
-
-    /**
-     * @param CategoryModel[] $categories
-     * @return array
-     */
-    public function handleContent($categories)
-    {
-        $result = [];
-
-        foreach ($categories as $category) {
-            $result[] = [
-                'id' => $category->id,
-                'name' => $category->name,
-            ];
-        }
-
-        return $result;
-    }
-
-}
diff --git a/app/Caches/CourseTeacherList.php b/app/Caches/CourseTeacherList.php
deleted file mode 100644
index 1c676f1a..00000000
--- a/app/Caches/CourseTeacherList.php
+++ /dev/null
@@ -1,63 +0,0 @@
-<?php
-/**
- * @copyright Copyright (c) 2021 深圳市酷瓜软件有限公司
- * @license https://opensource.org/licenses/GPL-2.0
- * @link https://www.koogua.com
- */
-
-namespace App\Caches;
-
-use App\Models\User as UserModel;
-use App\Repos\Course as CourseRepo;
-
-class CourseTeacherList extends Cache
-{
-
-    protected $lifetime = 86400;
-
-    public function getLifetime()
-    {
-        return $this->lifetime;
-    }
-
-    public function getKey($id = null)
-    {
-        return "course_teacher_list:{$id}";
-    }
-
-    public function getContent($id = null)
-    {
-        $courseRepo = new CourseRepo();
-
-        $users = $courseRepo->findTeachers($id);
-
-        if ($users->count() == 0) {
-            return [];
-        }
-
-        return $this->handleContent($users);
-    }
-
-    /**
-     * @param UserModel[] $users
-     * @return array
-     */
-    public function handleContent($users)
-    {
-        $result = [];
-
-        foreach ($users as $user) {
-            $result[] = [
-                'id' => $user->id,
-                'name' => $user->name,
-                'avatar' => $user->avatar,
-                'vip' => $user->vip,
-                'title' => $user->title,
-                'about' => $user->about,
-            ];
-        }
-
-        return $result;
-    }
-
-}
diff --git a/app/Caches/FeaturedArticleList.php b/app/Caches/FeaturedArticleList.php
index 86507ebe..7f1d7640 100644
--- a/app/Caches/FeaturedArticleList.php
+++ b/app/Caches/FeaturedArticleList.php
@@ -16,6 +16,8 @@ class FeaturedArticleList extends Cache
 
     protected $lifetime = 3600;
 
+    protected $limit = 5;
+
     public function getLifetime()
     {
         return $this->lifetime;
@@ -28,9 +30,7 @@ class FeaturedArticleList extends Cache
 
     public function getContent($id = null)
     {
-        $limit = 8;
-
-        $articles = $this->findArticles($limit);
+        $articles = $this->findArticles($this->limit);
 
         if ($articles->count() == 0) {
             return [];
@@ -67,7 +67,7 @@ class FeaturedArticleList extends Cache
      * @param int $limit
      * @return ResultsetInterface|Resultset|ArticleModel[]
      */
-    protected function findArticles($limit = 8)
+    protected function findArticles($limit = 5)
     {
         return ArticleModel::query()
             ->where('featured = 1')
diff --git a/app/Caches/FeaturedCourseList.php b/app/Caches/FeaturedCourseList.php
index c5c05c58..d9b26459 100644
--- a/app/Caches/FeaturedCourseList.php
+++ b/app/Caches/FeaturedCourseList.php
@@ -16,6 +16,8 @@ class FeaturedCourseList extends Cache
 
     protected $lifetime = 3600;
 
+    protected $limit = 5;
+
     public function getLifetime()
     {
         return $this->lifetime;
@@ -28,9 +30,7 @@ class FeaturedCourseList extends Cache
 
     public function getContent($id = null)
     {
-        $limit = 5;
-
-        $courses = $this->findCourses($limit);
+        $courses = $this->findCourses($this->limit);
 
         if ($courses->count() == 0) {
             return [];
diff --git a/app/Caches/FeaturedQuestionList.php b/app/Caches/FeaturedQuestionList.php
index 9a64b958..07ee392c 100644
--- a/app/Caches/FeaturedQuestionList.php
+++ b/app/Caches/FeaturedQuestionList.php
@@ -16,6 +16,8 @@ class FeaturedQuestionList extends Cache
 
     protected $lifetime = 3600;
 
+    protected $limit = 5;
+
     public function getLifetime()
     {
         return $this->lifetime;
@@ -28,9 +30,7 @@ class FeaturedQuestionList extends Cache
 
     public function getContent($id = null)
     {
-        $limit = 5;
-
-        $questions = $this->findQuestions($limit);
+        $questions = $this->findQuestions($this->limit);
 
         if ($questions->count() == 0) {
             return [];
diff --git a/app/Caches/HelpList.php b/app/Caches/HelpList.php
index 2899bbd8..5c30bea4 100644
--- a/app/Caches/HelpList.php
+++ b/app/Caches/HelpList.php
@@ -15,7 +15,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class HelpList extends Cache
 {
 
-    protected $lifetime = 365 * 86400;
+    protected $lifetime = 7 * 86400;
 
     public function getLifetime()
     {
diff --git a/app/Caches/HotQuestionList.php b/app/Caches/HotQuestionList.php
index 64220fd8..3afbec0b 100644
--- a/app/Caches/HotQuestionList.php
+++ b/app/Caches/HotQuestionList.php
@@ -14,13 +14,11 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class HotQuestionList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
-        $tomorrow = strtotime('tomorrow');
-
-        return $tomorrow - time();
+        return $this->lifetime;
     }
 
     public function getKey($id = null)
diff --git a/app/Caches/IndexArticleList.php b/app/Caches/IndexArticleList.php
index c892923f..43075b7c 100644
--- a/app/Caches/IndexArticleList.php
+++ b/app/Caches/IndexArticleList.php
@@ -14,7 +14,7 @@ use App\Services\Logic\Article\ArticleList as ArticleListService;
 class IndexArticleList extends Cache
 {
 
-    protected $lifetime = 15 * 60;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexFeaturedCourseList.php b/app/Caches/IndexFeaturedCourseList.php
index f7d0e6ae..77bb347b 100644
--- a/app/Caches/IndexFeaturedCourseList.php
+++ b/app/Caches/IndexFeaturedCourseList.php
@@ -19,7 +19,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexFeaturedCourseList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexFreeCourseList.php b/app/Caches/IndexFreeCourseList.php
index bc20a9dc..9ae4226c 100644
--- a/app/Caches/IndexFreeCourseList.php
+++ b/app/Caches/IndexFreeCourseList.php
@@ -19,7 +19,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexFreeCourseList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexLiveList.php b/app/Caches/IndexLiveList.php
index 734150a1..ae3dff4e 100644
--- a/app/Caches/IndexLiveList.php
+++ b/app/Caches/IndexLiveList.php
@@ -18,7 +18,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexLiveList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexNewCourseList.php b/app/Caches/IndexNewCourseList.php
index 4975cb27..457eb8ce 100644
--- a/app/Caches/IndexNewCourseList.php
+++ b/app/Caches/IndexNewCourseList.php
@@ -19,7 +19,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexNewCourseList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexQuestionList.php b/app/Caches/IndexQuestionList.php
index b79db98b..12bb02c1 100644
--- a/app/Caches/IndexQuestionList.php
+++ b/app/Caches/IndexQuestionList.php
@@ -14,7 +14,7 @@ use App\Services\Logic\Question\QuestionList as QuestionListService;
 class IndexQuestionList extends Cache
 {
 
-    protected $lifetime = 15 * 60;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexSimpleFeaturedCourseList.php b/app/Caches/IndexSimpleFeaturedCourseList.php
index b5433216..616a37bd 100644
--- a/app/Caches/IndexSimpleFeaturedCourseList.php
+++ b/app/Caches/IndexSimpleFeaturedCourseList.php
@@ -17,7 +17,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexSimpleFeaturedCourseList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexSimpleFreeCourseList.php b/app/Caches/IndexSimpleFreeCourseList.php
index 34a6d4f7..16b0e64f 100644
--- a/app/Caches/IndexSimpleFreeCourseList.php
+++ b/app/Caches/IndexSimpleFreeCourseList.php
@@ -17,7 +17,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexSimpleFreeCourseList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexSimpleNewCourseList.php b/app/Caches/IndexSimpleNewCourseList.php
index 7dffa5af..9dbd225c 100644
--- a/app/Caches/IndexSimpleNewCourseList.php
+++ b/app/Caches/IndexSimpleNewCourseList.php
@@ -17,7 +17,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexSimpleNewCourseList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexSimpleVipCourseList.php b/app/Caches/IndexSimpleVipCourseList.php
index 6756b39e..90f8b493 100644
--- a/app/Caches/IndexSimpleVipCourseList.php
+++ b/app/Caches/IndexSimpleVipCourseList.php
@@ -17,7 +17,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexSimpleVipCourseList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexSlideList.php b/app/Caches/IndexSlideList.php
index abc7d28c..00f15ae1 100644
--- a/app/Caches/IndexSlideList.php
+++ b/app/Caches/IndexSlideList.php
@@ -14,7 +14,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexSlideList extends Cache
 {
 
-    protected $lifetime = 365 * 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/IndexVipCourseList.php b/app/Caches/IndexVipCourseList.php
index 6b268160..e11ce1b2 100644
--- a/app/Caches/IndexVipCourseList.php
+++ b/app/Caches/IndexVipCourseList.php
@@ -19,7 +19,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class IndexVipCourseList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/TaggedArticleList.php b/app/Caches/TaggedArticleList.php
index d57faf7b..1c5c6df0 100644
--- a/app/Caches/TaggedArticleList.php
+++ b/app/Caches/TaggedArticleList.php
@@ -15,7 +15,7 @@ class TaggedArticleList extends Cache
 
     protected $limit = 5;
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/TaggedQuestionList.php b/app/Caches/TaggedQuestionList.php
index 7495823b..f76a5b29 100644
--- a/app/Caches/TaggedQuestionList.php
+++ b/app/Caches/TaggedQuestionList.php
@@ -15,7 +15,7 @@ class TaggedQuestionList extends Cache
 
     protected $limit = 5;
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/TopAnswererList.php b/app/Caches/TopAnswererList.php
index 37991604..4acaa8e7 100644
--- a/app/Caches/TopAnswererList.php
+++ b/app/Caches/TopAnswererList.php
@@ -16,7 +16,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class TopAnswererList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Caches/TopAuthorList.php b/app/Caches/TopAuthorList.php
index 882e4cab..1e6a2404 100644
--- a/app/Caches/TopAuthorList.php
+++ b/app/Caches/TopAuthorList.php
@@ -16,7 +16,7 @@ use Phalcon\Mvc\Model\ResultsetInterface;
 class TopAuthorList extends Cache
 {
 
-    protected $lifetime = 86400;
+    protected $lifetime = 3600;
 
     public function getLifetime()
     {
diff --git a/app/Services/Logic/Course/TeacherList.php b/app/Services/Logic/Course/TeacherList.php
deleted file mode 100644
index c40e5d48..00000000
--- a/app/Services/Logic/Course/TeacherList.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-/**
- * @copyright Copyright (c) 2021 深圳市酷瓜软件有限公司
- * @license https://opensource.org/licenses/GPL-2.0
- * @link https://www.koogua.com
- */
-
-namespace App\Services\Logic\Course;
-
-use App\Caches\CourseTeacherList as CourseTeacherListCache;
-use App\Services\Logic\CourseTrait;
-use App\Services\Logic\Service as LogicService;
-
-class TeacherList extends LogicService
-{
-
-    use CourseTrait;
-
-    public function handle($id)
-    {
-        $course = $this->checkCourse($id);
-
-        $cache = new CourseTeacherListCache();
-
-        $result = $cache->get($course->id);
-
-        return $result ?: [];
-    }
-
-}