diff --git a/src/components/common/preview/DocumentPreview.vue b/src/components/common/preview/DocumentPreview.vue
index f6e7f44..fb2f910 100644
--- a/src/components/common/preview/DocumentPreview.vue
+++ b/src/components/common/preview/DocumentPreview.vue
@@ -7,7 +7,7 @@
     <div v-else class="document-content">
       <!-- 文档信息 -->
       <div class="document-info">
-        <h4>{{ detailData.name || '文档标题' }}</h4>
+        <h4>{{ detailData.name}}.{{  detailData.fileUrl.split('.').pop() }}</h4>
         <div class="document-meta">
           <n-space>
             <n-tag type="success" size="small">
@@ -65,7 +65,7 @@
                 </n-icon>
               </div>
               <div class="document-type-info">
-                <h4>{{ detailData.name }}</h4>
+                <h4>{{ detailData.name }}.{{  detailData.fileUrl.split('.').pop() }}</h4>
                 <p class="file-description">{{ detailData.description }}</p>
               </div>
             </div>
@@ -73,7 +73,7 @@
             <!-- 操作按钮 -->
             <div class="document-operations">
               <n-space>
-                <n-button type="primary" size="large" @click="downloadDocument">
+                <n-button type="primary" @click="downloadDocument">
                   <template #icon>
                     <n-icon><DownloadOutline /></n-icon>
                   </template>
diff --git a/src/components/common/preview/HomeworkPreview.vue b/src/components/common/preview/HomeworkPreview.vue
index 55cb8ad..8cd8f20 100644
--- a/src/components/common/preview/HomeworkPreview.vue
+++ b/src/components/common/preview/HomeworkPreview.vue
@@ -59,8 +59,7 @@
       <!-- 作业描述 -->
       <div class="homework-description">
         <h5>作业描述</h5>
-        <div class="description-content">
-          {{ detailData.description || '暂无作业要求说明' }}
+        <div class="description-content" v-html="detailData.description">
         </div>
       </div>
 
diff --git a/src/components/common/preview/VideoPreview.vue b/src/components/common/preview/VideoPreview.vue
index 6503dd8..6e3dd33 100644
--- a/src/components/common/preview/VideoPreview.vue
+++ b/src/components/common/preview/VideoPreview.vue
@@ -12,7 +12,9 @@
           <n-space>
             <n-tag type="info" size="small">
               <template #icon>
-                <n-icon><PlayCircleOutline /></n-icon>
+                <n-icon>
+                  <PlayCircleOutline />
+                </n-icon>
               </template>
               视频
             </n-tag>
@@ -40,24 +42,6 @@
               <template #description>视频加载中...</template>
             </n-spin>
           </div>
-
-          <!-- 画质选择器（仅在需要手动切换时显示） -->
-          <div v-if="videoQualities.length > 1 && !dplayer?.switchQuality" class="quality-selector">
-            <n-space>
-              <span class="quality-label">画质:</span>
-              <n-button-group>
-                <n-button
-                  v-for="(quality, index) in videoQualities"
-                  :key="index"
-                  :type="currentQualityIndex === index ? 'primary' : 'default'"
-                  size="small"
-                  @click="switchQuality(index)"
-                >
-                  {{ quality.name }}
-                </n-button>
-              </n-button-group>
-            </n-space>
-          </div>
         </div>
 
         <div v-else class="no-video">
@@ -99,11 +83,9 @@ import {
   NIcon,
   NSpin,
   NResult,
-  NButton,
   NDivider,
   NDescriptions,
   NDescriptionsItem,
-  NButtonGroup,
   useMessage
 } from 'naive-ui'
 import { PlayCircleOutline } from '@vicons/ionicons5'
@@ -178,10 +160,10 @@ const getQualityNameFromUrl = (url: string, index: number): string => {
 }
 
 // 获取画质名称 - 根据链接内容判断画质
-const getQualityName = (index: number) => {
-  const quality = videoQualities.value[index]
-  return quality?.name || `画质${index + 1}`
-}
+// const getQualityName = (index: number) => {
+//   const quality = videoQualities.value[index]
+//   return quality?.name || `画质${index + 1}`
+// }
 
 // 获取当前播放的视频源
 const currentVideoSource = computed(() => {
@@ -219,6 +201,7 @@ const initDPlayer = async () => {
       defaultQuality: currentQualityIndex.value
     } : {}
 
+
     // 创建新的DPlayer实例
     dplayer = new DPlayer({
       container: dplayerContainer.value,
@@ -255,25 +238,8 @@ const initDPlayer = async () => {
       airplay: false,
       chromecast: false
     })
+    videoLoading.value = false
 
-    // 监听播放器事件
-    dplayer.on('loadstart', () => {
-      videoLoading.value = true
-    })
-
-    dplayer.on('loadedmetadata', () => {
-      videoLoading.value = false
-    })
-
-    dplayer.on('canplay', () => {
-      videoLoading.value = false
-    })
-
-    dplayer.on('error', (info?: any) => {
-      videoLoading.value = false
-      console.error('DPlayer播放错误:', info)
-      emit('error', '视频播放失败，请检查视频链接是否有效')
-    })
 
   } catch (error) {
     videoLoading.value = false
@@ -282,60 +248,6 @@ const initDPlayer = async () => {
   }
 }
 
-// 切换画质
-const switchQuality = async (index: number) => {
-  if (index === currentQualityIndex.value || !dplayer || videoQualities.value.length <= 1) return
-
-  try {
-    // 如果DPlayer支持内置画质切换，使用switchQuality方法
-    if (typeof dplayer.switchQuality === 'function') {
-      dplayer.switchQuality(index)
-      return
-    }
-
-    // 否则手动切换（保存当前播放状态）
-    const currentTime = dplayer.video.currentTime
-    const isPaused = dplayer.video.paused
-    const currentVolume = dplayer.volume()
-
-    currentQualityIndex.value = index
-
-    // 重新初始化播放器
-    await initDPlayer()
-
-    // 恢复播放状态
-    if (dplayer && dplayer.video) {
-      const waitForLoad = () => {
-        return new Promise<void>((resolve) => {
-          const checkLoad = () => {
-            if (dplayer && dplayer.video.readyState >= 2) {
-              try {
-                dplayer.video.currentTime = currentTime
-                dplayer.volume(currentVolume)
-                if (!isPaused) {
-                  dplayer.play().catch(console.error)
-                }
-              } catch (error) {
-                console.warn('恢复播放状态时出错:', error)
-              }
-              resolve()
-            } else {
-              setTimeout(checkLoad, 100)
-            }
-          }
-          checkLoad()
-        })
-      }
-
-      await waitForLoad()
-    }
-
-    message.success(`已切换到${getQualityName(index)}`)
-  } catch (error) {
-    console.error('切换画质失败:', error)
-    message.error('切换画质失败')
-  }
-}
 
 // 格式化文件大小
 const formatFileSize = (bytes: number | string) => {
@@ -450,57 +362,6 @@ onUnmounted(() => {
   z-index: 10;
 }
 
-.quality-selector {
-  position: absolute;
-  top: 12px;
-  right: 12px;
-  background: rgba(0, 0, 0, 0.7);
-  padding: 8px 12px;
-  border-radius: 6px;
-  z-index: 5;
-}
-
-.quality-label {
-  color: white;
-  font-size: 12px;
-}
-
-.no-video {
-  padding: 40px 20px;
-  text-align: center;
-}
-
-.video-description {
-  margin-bottom: 20px;
-}
-
-.video-description h5 {
-  margin: 0 0 8px 0;
-  font-size: 14px;
-  color: #333;
-  font-weight: 600;
-}
-
-.description-content {
-  background: #f8f9fa;
-  padding: 12px;
-  border-radius: 6px;
-  font-size: 14px;
-  line-height: 1.6;
-  color: #555;
-  white-space: pre-wrap;
-}
-
-.video-details {
-  margin-top: 20px;
-}
-
-.quality-count,
-.duration,
-.file-size {
-  white-space: nowrap;
-}
-
 /* DPlayer 样式覆盖 */
 :deep(.dplayer) {
   border-radius: 8px;
@@ -534,17 +395,5 @@ onUnmounted(() => {
   .dplayer-container {
     height: 250px;
   }
-
-  .quality-selector {
-    position: static;
-    background: rgba(0, 0, 0, 0.9);
-    margin-top: 8px;
-    border-radius: 6px;
-  }
-
-  .quality-label {
-    display: block;
-    margin-bottom: 4px;
-  }
 }
 </style>
\ No newline at end of file
diff --git a/src/views/Profile.vue b/src/views/Profile.vue
index 9417728..423ac5f 100644
--- a/src/views/Profile.vue
+++ b/src/views/Profile.vue
@@ -81,12 +81,12 @@
           </div>
 
           <!-- 我的下载 -->
-          <div :class="['image-text_26', { active: activeTab === 'download' }]" @click="handleMenuSelect('download')">
+          <!-- <div :class="['image-text_26', { active: activeTab === 'download' }]" @click="handleMenuSelect('download')">
             <img class="thumbnail_41 default-icon" referrerpolicy="no-referrer" src="/images/profile/download.png" />
             <img class="thumbnail_41 hover-icon" referrerpolicy="no-referrer"
               src="/images/profile/download-active.png" />
             <span class="text-group_26">我的下载</span>
-          </div>
+          </div> -->
         </div>
       </div>
 
diff --git a/src/views/teacher/course/ChapterManagement.vue b/src/views/teacher/course/ChapterManagement.vue
index 531113f..041e77d 100644
--- a/src/views/teacher/course/ChapterManagement.vue
+++ b/src/views/teacher/course/ChapterManagement.vue
@@ -149,7 +149,7 @@ const flattenedChapters = computed(() => {
     if (a.sortOrder === null && b.sortOrder === null) return 0
     if (a.sortOrder === null) return 1
     if (b.sortOrder === null) return -1
-    return (a.sortOrder || 0) - (b.sortOrder || 0)
+    return (b.sortOrder || 0) - (a.sortOrder || 0)
   })
 
   // 为每个章节添加其子节
diff --git a/src/views/teacher/course/DiscussionManagement.vue b/src/views/teacher/course/DiscussionManagement.vue
index 7d17359..adc4402 100644
--- a/src/views/teacher/course/DiscussionManagement.vue
+++ b/src/views/teacher/course/DiscussionManagement.vue
@@ -85,36 +85,13 @@
         </div>
       </div>
     </div>
-
-    <!-- 添加讨论模态框 -->
-    <n-modal v-model:show="showAddDiscussionModal" preset="card" title="添加讨论" style="width: 600px">
-      <div class="add-discussion-form">
-        <n-form :model="newDiscussion" label-placement="top">
-          <n-form-item label="讨论标题">
-            <n-input v-model:value="newDiscussion.title" placeholder="请输入讨论标题" />
-          </n-form-item>
-          <n-form-item label="所属章节">
-            <n-select v-model:value="newDiscussion.chapterId" :options="chapterOptions" placeholder="请选择章节" />
-          </n-form-item>
-          <n-form-item label="讨论内容">
-            <n-input v-model:value="newDiscussion.content" type="textarea" placeholder="请输入讨论内容" :rows="6" />
-          </n-form-item>
-        </n-form>
-      </div>
-      <template #footer>
-        <div class="modal-footer">
-          <n-button @click="showAddDiscussionModal = false">取消</n-button>
-          <n-button type="primary" @click="addDiscussion">确定</n-button>
-        </div>
-      </template>
-    </n-modal>
   </div>
 </template>
 
 <script setup lang="ts">
 import { ref, computed, h, onMounted } from 'vue'
 import { useRouter, useRoute } from 'vue-router'
-import { NButton, NInput, NDropdown, NIcon, NModal, NForm, NFormItem, NSelect, useMessage } from 'naive-ui'
+import { NButton, NInput, NDropdown, NIcon, useMessage } from 'naive-ui'
 import { DiscussionApi } from '@/api/modules/teachCourse'
 
 const message = useMessage()
@@ -123,12 +100,11 @@ const route = useRoute()
 
 // 响应式数据
 const searchKeyword = ref('')
-const showAddDiscussionModal = ref(false)
-const newDiscussion = ref({
-  title: '',
-  chapterId: '',
-  content: ''
-})
+// const newDiscussion = ref({
+//   title: '',
+//   chapterId: '',
+//   content: ''
+// })
 
 // 计算属性：排序后的讨论列表（置顶的在前）
 const sortedDiscussions = computed(() => {
@@ -215,12 +191,6 @@ const formatTime = (timeStr: string) => {
   }
 }
 
-// 章节选项
-const chapterOptions = [
-  { label: '第一章：基础概念', value: 'chapter1' },
-  { label: '第二章：进阶应用', value: 'chapter2' },
-  { label: '第三章：实战项目', value: 'chapter3' }
-]
 
 // 在组件挂载时加载讨论列表
 onMounted(() => {
@@ -290,15 +260,6 @@ const deleteDiscussion = () => {
   message.success('删除成功')
 }
 
-const addDiscussion = () => {
-  message.success('添加成功')
-  showAddDiscussionModal.value = false
-  newDiscussion.value = {
-    title: '',
-    chapterId: '',
-    content: ''
-  }
-}
 
 const viewComments = (discussion: any) => {
   router.push({
diff --git a/src/views/teacher/course/DiscussionRepliesManagement.vue b/src/views/teacher/course/DiscussionRepliesManagement.vue
index fac6ff2..c5bd80d 100644
--- a/src/views/teacher/course/DiscussionRepliesManagement.vue
+++ b/src/views/teacher/course/DiscussionRepliesManagement.vue
@@ -14,14 +14,8 @@
                     </template>
                     返回
                 </n-button>
-                <div class="page-title-section">
-                    <h1 class="page-title">{{ discussionInfo.title || '加载中...' }}</h1>
-                </div>
             </div>
             <div class="header-actions">
-                <n-button type="primary" @click="goToAddReply">
-                    添加回复
-                </n-button>
                 <div class="search-box">
                     <n-input v-model:value="searchKeyword" placeholder="请输入关键词" style="width: 200px;" clearable
                         @clear="clearSearch" @keyup.enter="handleSearch" />
@@ -32,8 +26,12 @@
 
         <!-- 讨论详情卡片 -->
         <div v-if="discussionInfo.title" class="discussion-detail-card">
+            <h1 class="page-title">{{ discussionInfo.title || '加载中...' }}</h1>
             <div class="discussion-content-preview" v-if="discussionInfo.content">
-                <div class="content-text" v-html="discussionInfo.content"></div>
+                <div class="page-content" v-html="discussionInfo.content"></div>
+            </div>
+            <div class="discussion-content-preview" v-if="discussionInfo.chapterName">
+                <div class="content-text" v-html="discussionInfo.chapterName"></div>
             </div>
             <div class="discussion-meta">
                 <span class="timestamp">{{ discussionInfo.timestamp }}</span>
@@ -42,7 +40,32 @@
 
         <!-- 回复列表 -->
         <div class="replies-list">
-            <!-- 搜索结果提示 -->
+            <div class="reply-box">
+                <div class="reply-total">全部评论 （{{ sortedReplies.length }}条）</div>
+
+                <div class="message-box">
+                    <div class="avatar">
+                        <img :src="userStore.user?.avatar"
+                            :alt="userStore.user?.profile?.realName || userStore.user?.nickname || userStore.user?.username"
+                            class="avatar">
+                        <div class="avatar-text">
+                            {{ userStore.user?.profile?.realName || userStore.user?.nickname || userStore.user?.username
+                            }}
+                        </div>
+                    </div>
+                    <div class="textarea">
+                        <n-input v-model:value="newReply.content" type="textarea" placeholder="请输入回复内容" :rows="6" />
+                        <div class="submit-box">
+                            <n-button>取消</n-button>
+                            <n-button type="primary" @click="addReply">
+                                发布
+                            </n-button>
+                        </div>
+                    </div>
+                </div>
+            </div>
+
+             <!-- 搜索结果提示 -->
             <div v-if="searchKeyword.trim()" class="search-result-tip">
                 <span v-if="sortedReplies.length === 0" class="no-result">
                     未找到包含"{{ searchKeyword.trim() }}"的回复
@@ -57,6 +80,8 @@
                 <p>暂无回复数据</p>
             </div>
 
+            <!-- 输入框 -->
+
             <!-- 回复项列表 -->
             <div v-for="reply in sortedReplies" :key="reply.id" class="reply-item">
                 <!-- 用户信息 -->
@@ -174,23 +199,6 @@
             </div>
         </div>
 
-        <!-- 添加回复模态框 -->
-        <n-modal v-model:show="showAddReplyModal" preset="card" title="添加回复" style="width: 600px">
-            <div class="add-reply-form">
-                <n-form :model="newReply" label-placement="top">
-                    <n-form-item label="回复内容">
-                        <n-input v-model:value="newReply.content" type="textarea" placeholder="请输入回复内容" :rows="6" />
-                    </n-form-item>
-                </n-form>
-            </div>
-            <template #footer>
-                <div class="modal-footer">
-                    <n-button @click="showAddReplyModal = false">取消</n-button>
-                    <n-button type="primary" @click="addReply">确定</n-button>
-                </div>
-            </template>
-        </n-modal>
-
         <!-- 回复回复模态框 -->
         <n-modal v-model:show="showReplyToReplyModal" preset="card" title="回复评论" style="width: 600px">
             <div class="reply-to-reply-form">
@@ -221,6 +229,9 @@ import { useRouter, useRoute } from 'vue-router'
 import { NButton, NInput, NIcon, NModal, NForm, NFormItem, useMessage } from 'naive-ui'
 import { DiscussionApi } from '@/api/modules/teachCourse'
 import type { CreateCommentRequest } from '@/api/modules/teachCourse'
+import { useUserStore } from '@/stores/user'
+
+const userStore = useUserStore()
 
 const message = useMessage()
 const router = useRouter()
@@ -589,10 +600,6 @@ const submitReplyToReply = async () => {
     }
 }
 
-// 跳转到添加回复页面
-const goToAddReply = () => {
-    showAddReplyModal.value = true
-}
 </script>
 
 <style scoped>
@@ -607,7 +614,6 @@ const goToAddReply = () => {
     justify-content: space-between;
     align-items: center;
     padding: 20px;
-    margin-bottom: 24px;
     padding-bottom: 16px;
     border-bottom: 1.5px solid #f6f6f6;
 }
@@ -631,10 +637,15 @@ const goToAddReply = () => {
 .page-title {
     font-size: 18px;
     font-weight: 500;
-    color: #333;
+    color: #0C99DA;
     margin: 0;
 }
 
+.page-content {
+    color: #333333;
+    font-size: 14px;
+}
+
 .discussion-title {
     font-size: 14px;
     color: #666;
@@ -683,11 +694,9 @@ const goToAddReply = () => {
 /* 讨论详情卡片 */
 .discussion-detail-card {
     background: #fff;
-    border: 1px solid #e8e8e8;
-    border-radius: 8px;
+    border-bottom: 1px solid #e8e8e8;
     margin: 0 20px 24px 20px;
     padding: 20px;
-    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
 }
 
 .discussion-header {
@@ -751,15 +760,14 @@ const goToAddReply = () => {
 }
 
 .discussion-content-preview {
-    margin-top: 12px;
+    margin-top: 6px;
 }
 
 .content-text {
-    font-size: 14px;
-    line-height: 1.6;
+    font-size: 12px;
     color: #333;
     background: #f8f9fa;
-    padding: 16px;
+    padding: 9px;
     border-radius: 6px;
 }
 
@@ -796,6 +804,40 @@ const goToAddReply = () => {
     font-size: 16px;
 }
 
+.reply-box {
+    display: flex;
+    flex-direction: column;
+    padding: 0 20px 20px 20px;
+    border-bottom: 1.5px solid #F1F3F4;
+    background: #fff;
+    transition: all 0.3s ease;
+    position: relative;
+}
+
+.reply-total {
+    margin-bottom: 16px;
+}
+
+.message-box {
+    display: flex;
+}
+
+.avatar {
+    margin-right: 10px;
+}
+
+.textarea {
+    width: 100%;
+}
+
+.submit-box{
+    width: 100%;
+    margin: 10px 0;
+    display: flex;
+    justify-content: flex-end;
+    gap: 10px;
+} 
+
 .reply-item {
     display: flex;
     padding: 0 20px 20px 20px;
@@ -834,7 +876,6 @@ const goToAddReply = () => {
 
 /* 回复内容 */
 .reply-content {
-    padding-top: 6px;
     flex: 1;
     margin-right: 16px;
 }
@@ -859,7 +900,6 @@ const goToAddReply = () => {
     font-size: 14px;
     color: #333;
     line-height: 1.6;
-    margin-bottom: 12px;
 }
 
 .reply-meta {
@@ -918,14 +958,7 @@ const goToAddReply = () => {
 
 /* 嵌套回复样式 */
 .nested-replies {
-    margin-top: 16px;
-    padding-left: 20px;
-    border-left: 2px solid #f0f0f0;
-    background: #fafafa;
-    border-radius: 0 8px 8px 0;
     padding-top: 12px;
-    padding-bottom: 8px;
-    padding-right: 12px;
 }
 
 .nested-reply-item {
diff --git a/src/views/teacher/course/FileViewer.vue b/src/views/teacher/course/FileViewer.vue
index 37edbf3..dba0b06 100644
--- a/src/views/teacher/course/FileViewer.vue
+++ b/src/views/teacher/course/FileViewer.vue
@@ -111,7 +111,8 @@ import { useRouter } from 'vue-router'
 import { useMessage } from 'naive-ui'
 import { ArrowBackOutline } from '@vicons/ionicons5'
 import { downloadFileFromUrl, getFileExtension } from '@/utils/download'
-import { 
+import DPlayer from 'dplayer'
+import {
   FolderOutline,
   VideocamOutline,
   ImageOutline,
@@ -121,13 +122,6 @@ import {
   AttachOutline
 } from '@vicons/ionicons5'
 
-// 声明全局 DPlayer 类型
-declare global {
-  interface Window {
-    DPlayer: any
-    Hls: any
-  }
-}
 
 const router = useRouter()
 const message = useMessage()
@@ -155,7 +149,7 @@ const breadcrumbs = ref<FileItem[]>([])
 const dplayerRef = ref<HTMLElement | null>(null)
 const dplayer = ref<any>(null)
 const videoQualities = ref<VideoQuality[]>([])
-const currentQuality = ref<string>('')
+// const currentQuality = ref<string>('')
 
 // 视频画质类型定义
 interface VideoQuality {
@@ -250,83 +244,55 @@ const parseVideoQualities = (fileUrl: string): VideoQuality[] => {
 
   // 按逗号分割URL
   const urls = fileUrl.split(',').map(url => url.trim()).filter(url => url)
-  
+
   if (urls.length <= 1) {
     return [{
       name: '原画',
       url: fileUrl,
-      type: fileUrl.includes('.m3u8') ? 'hls' : 'normal'
+      type: 'auto'
     }]
   }
 
-  const qualities: VideoQuality[] = []
-  
-  for (const url of urls) {
-    const quality = extractQualityFromUrl(url)
-    qualities.push({
-      name: quality,
-      url: url,
-      type: url.includes('.m3u8') ? 'hls' : 'normal'
-    })
-  }
-
-  // 按画质排序（从高到低）
-  return qualities.sort((a, b) => {
-    const aRes = getResolutionValue(a.name)
-    const bRes = getResolutionValue(b.name)
-    return bRes - aRes
-  })
-}
-
-// 从URL中提取画质信息
-const extractQualityFromUrl = (url: string): string => {
-  const patterns = [
-    { pattern: /\/(\d+p)\//i, extract: (match: RegExpMatchArray) => match[1] },
-    { pattern: /\/(\d+)\//i, extract: (match: RegExpMatchArray) => `${match[1]}p` }
-  ]
-
-  for (const { pattern, extract } of patterns) {
-    const match = url.match(pattern)
-    if (match) {
-      return extract(match).toUpperCase()
+  // 按画质排序：480p -> 720p -> 1080p
+  return urls.sort((a: string, b: string) => {
+    const getQualityOrder = (url: string): number => {
+      if (url.includes('1080p') || url.includes('1080')) return 3
+      if (url.includes('720p') || url.includes('720')) return 2
+      if (url.includes('480p') || url.includes('480')) return 1
+      return 0
     }
-  }
-
-  // 尝试从路径推断
-  if (url.includes('1080')) return '1080P'
-  if (url.includes('720')) return '720P'
-  if (url.includes('480')) return '480P'
-  if (url.includes('360')) return '360P'
-  
-  return '原画'
+    return getQualityOrder(a) - getQualityOrder(b)
+  }).map((url: string, index: number) => ({
+    name: getQualityNameFromUrl(url, index),
+    url,
+    type: 'auto'
+  }))
 }
 
-// 获取分辨率数值（用于排序）
-const getResolutionValue = (quality: string): number => {
-  const resolutionMap: { [key: string]: number } = {
-    '1080P': 1080,
-    '720P': 720,
-    '480P': 480,
-    '360P': 360,
-    '原画': 9999
-  }
-  return resolutionMap[quality] || 0
+// 根据URL获取画质名称
+const getQualityNameFromUrl = (url: string, index: number): string => {
+  if (url.includes('1080p') || url.includes('1080')) return '1080p'
+  if (url.includes('720p') || url.includes('720')) return '720p'
+  if (url.includes('480p') || url.includes('480')) return '480p'
+
+  const defaultQualities = ['480p', '720p', '1080p']
+  return defaultQualities[index] || `画质${index + 1}`
 }
 
-// 获取默认画质
-const getDefaultQuality = (qualities: VideoQuality[]): VideoQuality | null => {
-  if (qualities.length === 0) return null
-  
-  // 优先选择720P
-  const preferred = qualities.find(q => q.name === '720P')
-  if (preferred) return preferred
-  
-  // 其次选择1080P
-  const fallback = qualities.find(q => q.name === '1080P')
-  if (fallback) return fallback
-  
-  // 最后返回第一个
-  return qualities[0]
+// 获取默认画质索引
+const getDefaultQualityIndex = (qualities: VideoQuality[]): number => {
+  if (qualities.length === 0) return 0
+
+  // 优先选择720p
+  const preferred = qualities.findIndex(q => q.name === '720p')
+  if (preferred !== -1) return preferred
+
+  // 其次选择480p
+  const fallback = qualities.findIndex(q => q.name === '480p')
+  if (fallback !== -1) return fallback
+
+  // 最后返回第一个（最低画质）
+  return 0
 }
 
 // 获取视频画质选项
@@ -339,10 +305,22 @@ const getVideoQualities = (file: FileItem): VideoQuality[] => {
   return parseVideoQualities(fileUrl)
 }
 
+// 获取当前播放的视频源
+const getCurrentVideoSource = (qualities: VideoQuality[], qualityIndex: number) => {
+  if (qualities.length === 0) return null
+
+  const currentQuality = qualities[qualityIndex]
+  return {
+    url: currentQuality.url,
+    pic: currentFile.value?.originalData?.thumbnailUrl || '',
+    type: 'auto'
+  }
+}
+
 // 初始化视频播放器
 const initVideoPlayer = async (file: FileItem) => {
   await nextTick()
-  
+
   if (!dplayerRef.value) {
     console.error('视频容器未找到')
     return
@@ -366,76 +344,63 @@ const initVideoPlayer = async (file: FileItem) => {
 
   const qualities = getVideoQualities(file)
   videoQualities.value = qualities
-  
-  // 设置默认画质
-  const defaultQuality = getDefaultQuality(qualities)
-  let videoUrl = fileUrl
-  
-  if (defaultQuality) {
-    currentQuality.value = defaultQuality.name
-    videoUrl = defaultQuality.url
-  }
 
-  // 检查是否需要加载HLS.js
-  const isHLS = videoUrl.includes('.m3u8')
-  if (isHLS && !window.Hls && !(window as any).Hls) {
-    await loadHLSScript()
+  // 获取默认画质索引
+  const defaultQualityIndex = getDefaultQualityIndex(qualities)
+  const currentVideoSource = getCurrentVideoSource(qualities, defaultQualityIndex)
+
+  if (!currentVideoSource) {
+    console.error('无法获取视频源')
+    return
   }
 
   try {
-    // 检查DPlayer是否存在
-    if (!window.DPlayer) {
-      await loadDPlayerScript()
-    }
+    // 清空容器内容
+    dplayerRef.value.innerHTML = ''
+
+    // 准备画质配置
+    const qualityConfig = qualities.length > 1 ? {
+      quality: qualities,
+      defaultQuality: defaultQualityIndex
+    } : {}
 
     const options: any = {
       container: dplayerRef.value,
-      autoplay: false,
-      theme: '#1890ff',
+      video: {
+        url: currentVideoSource.url,
+        pic: currentVideoSource.pic,
+        type: 'auto',
+        ...qualityConfig,
+      },
+      subtitle: {
+        url: '',
+        type: 'webvtt',
+        fontSize: '20px',
+        bottom: '40px',
+        color: '#fff'
+      },
+      contextmenu: [
+        {
+          text: '视频信息',
+          click: () => {
+            message.info(`视频: ${file.name || '未知'}`)
+          }
+        }
+      ],
+      theme: '#FADFA3',
       loop: false,
       lang: 'zh-cn',
-      screenshot: true,
+      screenshot: false,
       hotkey: true,
-      preload: 'auto',
-      volume: 0.8,
-      video: {
-        url: videoUrl,
-        type: isHLS ? 'hls' : 'normal'
-      }
+      preload: 'metadata',
+      volume: 0.7,
+      mutex: true,
+      pictureInPicture: false,
+      airplay: false,
+      chromecast: false
     }
 
-    // 如果有多个画质，添加画质选择
-    if (qualities.length > 1) {
-      options.video.quality = qualities.map(q => ({
-        name: q.name,
-        url: q.url,
-        type: q.type || (q.url.includes('.m3u8') ? 'hls' : 'normal')
-      }))
-      options.video.defaultQuality = 0 // 默认选择第一个（最高画质）
-    }
-
-    // HLS特殊处理
-    if (isHLS && (window as any).Hls && (window as any).Hls.isSupported()) {
-      options.video.customType = {
-        hls: function(video: HTMLVideoElement, _player: any) {
-          const hls = new (window as any).Hls({
-            debug: false,
-            enableWorker: true,
-            lowLatencyMode: false
-          })
-          hls.loadSource(video.src)
-          hls.attachMedia(video)
-        }
-      }
-    }
-
-    dplayer.value = new window.DPlayer(options)
-    
-    // 监听画质切换
-    dplayer.value.on('quality_end', (quality: any) => {
-      currentQuality.value = quality.name
-      console.log('画质切换到:', quality.name)
-    })
+    dplayer.value = new DPlayer(options)
 
     console.log('✅ DPlayer 初始化成功')
   } catch (error) {
@@ -443,49 +408,6 @@ const initVideoPlayer = async (file: FileItem) => {
   }
 }
 
-// 加载DPlayer脚本
-const loadDPlayerScript = (): Promise<void> => {
-  return new Promise((resolve, reject) => {
-    if (window.DPlayer) {
-      resolve()
-      return
-    }
-
-    const script = document.createElement('script')
-    script.src = 'https://cdn.jsdelivr.net/npm/dplayer@1.27.1/dist/DPlayer.min.js'
-    script.onload = () => {
-      console.log('✅ DPlayer脚本加载成功')
-      resolve()
-    }
-    script.onerror = (error) => {
-      console.error('❌ DPlayer脚本加载失败:', error)
-      reject(new Error('Failed to load DPlayer'))
-    }
-    document.head.appendChild(script)
-  })
-}
-
-// 加载HLS.js脚本
-const loadHLSScript = (): Promise<void> => {
-  return new Promise((resolve, reject) => {
-    if ((window as any).Hls) {
-      resolve()
-      return
-    }
-
-    const script = document.createElement('script')
-    script.src = 'https://cdn.jsdelivr.net/npm/hls.js@1.5.15/dist/hls.min.js'
-    script.onload = () => {
-      console.log('✅ HLS.js脚本加载成功')
-      resolve()
-    }
-    script.onerror = (error) => {
-      console.error('❌ HLS.js脚本加载失败:', error)
-      reject(new Error('Failed to load HLS.js'))
-    }
-    document.head.appendChild(script)
-  })
-}
 // 构建面包屑导航
 const buildBreadcrumbs = (file: FileItem, folderData?: FileItem) => {
   const crumbs: FileItem[] = []
diff --git a/src/views/teacher/course/HomeworkReview.vue b/src/views/teacher/course/HomeworkReview.vue
index 2833c0c..67ef7f4 100644
--- a/src/views/teacher/course/HomeworkReview.vue
+++ b/src/views/teacher/course/HomeworkReview.vue
@@ -25,15 +25,9 @@
       <!-- 空状态占位 -->
       <div v-if="filteredHomeworks.length === 0 && !loading" class="empty-state">
         <n-empty
-          description="还没有作业"
+          description="暂无数据"
           size="large"
         >
-          <template #icon>
-            <div class="empty-icon">📝</div>
-          </template>
-          <template #extra>
-            <span class="empty-extra">请先去创建作业吧~</span>
-          </template>
         </n-empty>
       </div>
 
@@ -48,7 +42,7 @@
           </div>
           <div class="card-content">
             <div class="content-left">
-              <p class="homework-desc">{{ homework.content }}</p>
+              <p class="homework-desc" v-html="homework.content"></p>
               <div class="homework-info">
                 <div class="info-item">
                   <img class="icon" src="/images/teacher/发布人.png" alt="发布人" />
diff --git a/src/views/teacher/course/HomeworkReviewDetail.vue b/src/views/teacher/course/HomeworkReviewDetail.vue
index 7154249..86a9c95 100644
--- a/src/views/teacher/course/HomeworkReviewDetail.vue
+++ b/src/views/teacher/course/HomeworkReviewDetail.vue
@@ -24,7 +24,7 @@
       <!-- 右侧按钮和搜索 -->
       <div class="actions-container">
         <n-button class="action-btn export-btn" ghost type="primary" size="small">导出</n-button>
-        <n-button class="action-btn remove-btn" ghost type="error" size="small">移除</n-button>
+        <!-- <n-button class="action-btn remove-btn" ghost type="error" size="small">移除</n-button> -->
         <div class="search-container">
           <n-input-group>
             <n-input v-model:value="searchText" placeholder="请输入学生姓名" :style="{ width: '200px' }" size="medium" />