diff --git a/Html/.log b/Html/.log
index e69de29..9877e2f 100644
--- a/Html/.log
+++ b/Html/.log
@@ -0,0 +1,631 @@
+name='算法分析与设计' description='测试：算法分析与设计课程' teacher_id='TCake' created_at=datetime.datetime(2025, 9, 5, 19, 48, 10, 16000) updated_at=datetime.datetime(2025, 11, 3, 13, 43, 44, 383000) image_url='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/TCake_book_cover.png' chapters=[Chapter(chapter_name='第一周', lessons=[Lesson(lesson_name='效率的重要性与实践验证', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_score_prompt.md')]), Chapter(chapter_name='第二周', lessons=[Lesson(lesson_name='分治法与代表算法——归并排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_score_prompt.md')]), Chapter(chapter_name='第三周', lessons=[Lesson(lesson_name='分治法实践与优化', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_score_prompt.md')]), Chapter(chapter_name='第四周', lessons=[Lesson(lesson_name='基于比较的排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_score_prompt.md')]), Chapter(chapter_name='第五周', lessons=[Lesson(lesson_name='非比较型排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_score_prompt.md')]), Chapter(chapter_name='基础算法', lessons=[Lesson(lesson_name='二分', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_score_prompt.md')])]
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+ * Restarting with stat
+ * Debugger is active!
+ * Debugger PIN: 188-535-136
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+name='算法分析与设计' description='测试：算法分析与设计课程' teacher_id='TCake' created_at=datetime.datetime(2025, 9, 5, 19, 48, 10, 16000) updated_at=datetime.datetime(2025, 11, 3, 13, 43, 44, 383000) image_url='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/TCake_book_cover.png' chapters=[Chapter(chapter_name='第一周', lessons=[Lesson(lesson_name='效率的重要性与实践验证', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_score_prompt.md')]), Chapter(chapter_name='第二周', lessons=[Lesson(lesson_name='分治法与代表算法——归并排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_score_prompt.md')]), Chapter(chapter_name='第三周', lessons=[Lesson(lesson_name='分治法实践与优化', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_score_prompt.md')]), Chapter(chapter_name='第四周', lessons=[Lesson(lesson_name='基于比较的排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_score_prompt.md')]), Chapter(chapter_name='第五周', lessons=[Lesson(lesson_name='非比较型排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_score_prompt.md')]), Chapter(chapter_name='基础算法', lessons=[Lesson(lesson_name='二分', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_score_prompt.md')])]
+name='算法分析与设计' description='测试：算法分析与设计课程' teacher_id='TCake' created_at=datetime.datetime(2025, 9, 5, 19, 48, 10, 16000) updated_at=datetime.datetime(2025, 11, 3, 13, 43, 44, 383000) image_url='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/TCake_book_cover.png' chapters=[Chapter(chapter_name='第一周', lessons=[Lesson(lesson_name='效率的重要性与实践验证', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250916T050319Z_score_prompt.md')]), Chapter(chapter_name='第二周', lessons=[Lesson(lesson_name='分治法与代表算法——归并排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T153841Z_score_prompt.md')]), Chapter(chapter_name='第三周', lessons=[Lesson(lesson_name='分治法实践与优化', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250922T154450Z_score_prompt.md')]), Chapter(chapter_name='第四周', lessons=[Lesson(lesson_name='基于比较的排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131013Z_score_prompt.md')]), Chapter(chapter_name='第五周', lessons=[Lesson(lesson_name='非比较型排序', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20251103T131045Z_score_prompt.md')]), Chapter(chapter_name='基础算法', lessons=[Lesson(lesson_name='二分', markdown_lesson_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_lesson.md', markdown_prompt_file_name='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_prompt.md', markdown_score_prompt_file_link='https://hsamooc-cdn-1374354408.cos.ap-guangzhou.myqcloud.com/materials_68bacdfadf5aeae0912f7f18_untitled_untitled_20250905T194845Z_score_prompt.md')])]
+59.78.194.184,127.0.0.1 - - [03/Nov/2025 16:10:20] "GET /materials/68bacdfadf5aeae0912f7f18 HTTP/1.1" 200 4434 0.005099
+(41568) accepted ('127.0.0.1', 52830)
+59.78.194.184,127.0.0.1 - - [03/Nov/2025 16:12:34] "POST /api/materials/save/68bacdfadf5aeae0912f7f18/%E7%AC%AC%E5%9B%9B%E5%91%A8/%E5%9F%BA%E4%BA%8E%E6%AF%94%E8%BE%83%E7%9A%84%E6%8E%92%E5%BA%8F HTTP/1.1" 200 1082 0.585302
+59.78.194.184,127.0.0.1 - - [03/Nov/2025 16:14:05] "POST /api/upload HTTP/1.1" 200 327 0.510310
diff --git a/Html/app.py b/Html/app.py
index 8369740..9209929 100644
--- a/Html/app.py
+++ b/Html/app.py
@@ -12,7 +12,7 @@ if __name__ == "__main__":
         app,
         host="0.0.0.0",
         port=5551,
-        debug=False,                # 开发期打开
+        debug=True,                # 开发期打开
         # allow_unsafe_werkzeug=True, # 避免 dev server 的安全限制提示
         # ssl_context=('server.crt', 'server.key')
     )
diff --git a/Html/apps/static/css/lesson.css b/Html/apps/static/css/lesson.css
index 3b0b39f..f123176 100644
--- a/Html/apps/static/css/lesson.css
+++ b/Html/apps/static/css/lesson.css
@@ -125,7 +125,7 @@
   .tab-btn.active { background:#f0f8ff; border-color:#a0c4ff; }
   .actions { margin-left:auto; }
   .actions button { padding:6px 12px; border:none; border-radius:8px; background:#4CAF50; color:#fff; cursor:pointer; }
-  .tab-content { flex:1; padding:8px; }
+  .tab-content { flex:1; padding:8px;display: flex; }
   .tab { display:none; height:100%; }
   .tab.active { display:block; height:100%; }
   textarea {
diff --git a/Html/apps/static/css/lesson_markdown.css b/Html/apps/static/css/lesson_markdown.css
new file mode 100644
index 0000000..0ac4cdc
--- /dev/null
+++ b/Html/apps/static/css/lesson_markdown.css
@@ -0,0 +1,56 @@
+/* 左右分栏：左=编辑，右=预览 */
+  .editor-pane {
+    grid-template-columns: 1fr 1fr; /* 左右各一半 */
+    gap: 12px;
+    align-items: start;
+  }
+  /* 兼容你页面现有布局：让编辑区域（左半）占满左侧 */
+  .tab-content {
+    height: calc(100vh - 220px); /* 视口高度自适应，按需调整 */
+    overflow: hidden; /* 内部由 EasyMDE 自己滚动 */
+    display: flex;
+  }
+  .tab {
+    height: 100%;
+  }
+  .tab textarea {
+    height: 100%;
+  }
+  /* 右侧预览 */
+  .md-preview-pane {
+    border: 1px solid #e5e7eb;
+    border-radius: 8px;
+    padding: 16px;
+    background: #fff;
+    height: calc(100vh - 220px);
+    overflow: auto;
+  }
+  .md-preview-pane h1, .md-preview-pane h2, .md-preview-pane h3 {
+    border-bottom: 1px solid #f1f5f9;
+    padding-bottom: .3em;
+    margin-top: 1.2em;
+  }
+  .md-preview-pane img {
+    max-width: 100%;
+    height: auto;
+  }
+  /* 只影响右侧 Markdown 预览里的表格 */
+.md-preview-pane .table {
+  /* 如果你想完全摆脱 bootstrap.table 的影响 */
+  all: revert;         /* 或者 all: unset; 视需求选择 */
+  display: table;
+  border-collapse: collapse;
+  /* 下面写你自己的表格样式 */
+  border: 1px solid #e5e7eb;
+}
+
+.md-preview-pane .table th,
+.md-preview-pane .table td {
+  border: 1px solid #e5e7eb;
+  padding: 8px 10px;
+}
+
+.md-preview-pane .table thead th {
+  background: #f8fafc;
+  font-weight: 600;
+}
diff --git a/Html/apps/static/js/lesson.js b/Html/apps/static/js/lesson.js
index fbabd45..02fd2f8 100644
--- a/Html/apps/static/js/lesson.js
+++ b/Html/apps/static/js/lesson.js
@@ -801,10 +801,11 @@ function ValidTextareaNoBlankHead(textarea) {
   // 更新 textarea 的值（如果有变化）
   textarea.value = lines.join("\n");
 }
-const editors = document.querySelectorAll("textarea");
+const editorsDoc = document.querySelectorAll("textarea");
 const PREFIX = "### ";
 // 记录每个 textarea 最新的“标题内容”（不含前缀）
 const lastTitleMap = new Map();
+
   // 防止循环触发
   let isProgrammaticUpdate = false;
   function getFirstLine(text) {
@@ -823,7 +824,7 @@ const lastTitleMap = new Map();
     return { line: normalized, title };
   }
     // 初始化 lastTitleMap（把当前值规范化一次）
-  editors.forEach(ed => {
+  editorsDoc.forEach(ed => {
     const rawFirst = getFirstLine(ed.value || "");
     const { line, title } = normalizeFirstLine(rawFirst);
     if (line !== rawFirst) {
@@ -837,7 +838,7 @@ const lastTitleMap = new Map();
   function syncOthers(sourceEditor, newTitle) {
     isProgrammaticUpdate = true;
     try {
-      editors.forEach(ed => {
+      editorsDoc.forEach(ed => {
         if (ed === sourceEditor) return;
         const first = getFirstLine(ed.value || "");
         const { line } = normalizeFirstLine(first);
@@ -851,56 +852,204 @@ const lastTitleMap = new Map();
       isProgrammaticUpdate = false;
     }
   }
-editors.forEach(editor => {
-  editor.addEventListener("input", (event) => {
-    const textarea = event.target
-    const value = event.target.value;
-    const type = event.target.dataset.type;
-    // 在这里做提示或校验
-    console.log(`内容已更改: ${event.target.id} => ${value}`);
+  
+// ==== 前置：你的三编辑器实例与 id 映射（按你实际为准）====
+const ID_LESSON = 'editor-lesson';
+const ID_PROMPT = 'editor-prompt';
+const ID_SCORE  = 'editor-score';
 
-    ValidTextareaNoBlankHead(event.target)
+// editors: { [textareaId]: EasyMDEInstance }
+const editorIds = [ID_LESSON, ID_PROMPT, ID_SCORE];
 
-    const rawFirst = getFirstLine(value);
+// 全局防抖/重入保护：避免程序化更新再触发同步
+
+// // 记录上一次各编辑器的标题文本（不含 "### " 前缀）
+// const lastTitleMap = new Map();
+
+// —— 工具：从 EasyMDE 拿值 / 设值（会同步 textarea，因为 forceSync:true）——
+const getMD = (id) => editors[id].value();
+const setMD = (id, text) => editors[id].value(text);
+
+// —— 工具：仅替换“首行”为 normalizedLine，尽量不破坏光标与撤销栈 ——
+// line 是完整首行文本（含 "### "）
+function setFirstLineInEditor(ed, normalizedLine) {
+  const cm = ed.codemirror;
+  cm.operation(() => {
+    const doc = cm.getDoc();
+    const firstLine = doc.getLine(0) ?? "";
+    if (firstLine === normalizedLine) return;
+
+    // 记住用户光标
+    const cursors = doc.listSelections();
+
+    // 用 replaceRange 仅替换首行
+    doc.replaceRange(
+      normalizedLine,
+      { line: 0, ch: 0 },
+      { line: 0, ch: firstLine.length }
+    );
+
+    // 尽力恢复光标（如果原先在首行，偏移可能要校正）
+    doc.setSelections(cursors);
+  });
+}
+
+// —— 工具：从 Markdown 文本取首行（兼容你现有函数）
+function getFirstLineFromText(text) {
+  const idx = text.indexOf('\n');
+  return idx === -1 ? text : text.slice(0, idx);
+}
+
+// —— 工具：把 normalizedLine 写回文本首行（备用：整段 setValue）——
+function setFirstLineInText(text, normalizedLine) {
+  const idx = text.indexOf('\n');
+  return idx === -1 ? normalizedLine : (normalizedLine + text.slice(idx));
+}
+
+// —— 同步另外两个编辑器的首行（仅标题行），避免全文覆盖 —— 
+function syncOthersTitle(fromId, titleText /*不含前缀*/, normalizedLine /*含### */) {
+  editorIds.forEach((id) => {
+    if (id === fromId) return;
+    const ed = editors[id];
+    if (!ed) return;
+
+    const currentFirst = ed.codemirror.getDoc().getLine(0) ?? "";
+    if (currentFirst !== normalizedLine) {
+      setFirstLineInEditor(ed, normalizedLine);
+      lastTitleMap.set(ed, titleText);
+    }
+  });
+}
+
+// —— 更新 tab 按钮上的 “*” 修改状态（保持你原逻辑）——
+function refreshTabDirtyBadges() {
+  let btn = document.getElementById("tab-btn-lesson");
+  if (CURRENT.active.lesson !== getMD(ID_LESSON)) {
+    btn.innerText = AddModifiedStat(btn.innerText);
+  } else {
+    btn.innerText = ClearModifiedStat(btn.innerText);
+  }
+
+  btn = document.getElementById("tab-btn-prompt");
+  if (CURRENT.active.prompt !== getMD(ID_PROMPT)) {
+    btn.innerText = AddModifiedStat(btn.innerText);
+  } else {
+    btn.innerText = ClearModifiedStat(btn.innerText);
+  }
+
+  btn = document.getElementById("tab-btn-score");
+  if (CURRENT.active.score !== getMD(ID_SCORE)) {
+    btn.innerText = AddModifiedStat(btn.innerText);
+  } else {
+    btn.innerText = ClearModifiedStat(btn.innerText);
+  }
+}
+
+// —— 单个编辑器的 change 处理器工厂 —— 
+function bindEditorChangeHandler(textareaId) {
+  const ed = editors[textareaId];
+  const cm = ed.codemirror;
+
+  // 初始化 lastTitleMap
+  lastTitleMap.set(ed, "");
+
+  cm.on('change', () => {
+    if (isProgrammaticUpdate) return;
+
+    const value = ed.value();
+    const rawFirst = getFirstLineFromText(value);
+
+    // 你自己的校验（如果要继续保留）
+    // ValidTextareaNoBlankHead(ed.element.nextSibling /* textarea DOM? */);
+
+    // 归一化首行，要求 "### " 前缀
     const { line: normalizedLine, title: currentTitle } = normalizeFirstLine(rawFirst);
 
+    // 若首行不规范，程序化改回去（仅替换首行）
     if (normalizedLine !== rawFirst) {
-      isProgrammaticUpdate = true;// 把首行改回以 '### ' 开头
+      isProgrammaticUpdate = true;
       try {
-        textarea.value = setFirstLine(value, normalizedLine);
+        setFirstLineInEditor(ed, normalizedLine);
       } finally {
         isProgrammaticUpdate = false;
       }
     }
-    const lastTitle = lastTitleMap.get(textarea) ?? "";// —— 2) 如标题内容有变化，则同步到其他两个 —— //
+
+    // 标题变化则同步到其他两个编辑器（只同步首行）
+    const lastTitle = lastTitleMap.get(ed) ?? "";
     if (currentTitle !== lastTitle) {
-      lastTitleMap.set(textarea, currentTitle);// 更新自身记录
-      syncOthers(textarea, currentTitle);
+      lastTitleMap.set(ed, currentTitle);
+      isProgrammaticUpdate = true;
+      try {
+        syncOthersTitle(textareaId, currentTitle, normalizedLine);
+      } finally {
+        isProgrammaticUpdate = false;
+      }
     }
 
-    let btn = document.getElementById("tab-btn-lesson");
-    if (CURRENT.active.lesson != document.getElementById("editor-lesson").value){
-      btn.innerText = AddModifiedStat(btn.innerText)
-    }else{
-      btn.innerText = ClearModifiedStat(btn.innerText)
-    }
-    btn = document.getElementById("tab-btn-prompt");
-    if (CURRENT.active.prompt != document.getElementById("editor-prompt").value){
-        btn.innerText = AddModifiedStat(btn.innerText)
-    }else{
-        btn.innerText = ClearModifiedStat(btn.innerText)
-    }
-    btn = document.getElementById("tab-btn-score");
-    if (CURRENT.active.score != document.getElementById("editor-score").value){
-        btn.innerText = AddModifiedStat(btn.innerText)
-    }else{
-        btn.innerText = ClearModifiedStat(btn.innerText)
+    // 刷新三个 Tab 的“修改中 * ”标识
+    refreshTabDirtyBadges();
+
+    // 如果你还有右侧预览：
+    if (typeof renderToPreview === 'function' && textareaId === activeId) {
+      renderToPreview(ed.value());
     }
   });
-});
+}
+
+// 绑定三个编辑器
+editorIds.forEach(bindEditorChangeHandler);
+
+// editorsDoc.forEach(editor => {
+//   editor.addEventListener("input", (event) => {
+//     const textarea = event.target
+//     const value = event.target.value;
+//     const type = event.target.dataset.type;
+//     // 在这里做提示或校验
+//     console.log(`内容已更改: ${event.target.id} => ${value}`);
+
+//     ValidTextareaNoBlankHead(event.target)
+
+//     const rawFirst = getFirstLine(value);
+//     const { line: normalizedLine, title: currentTitle } = normalizeFirstLine(rawFirst);
+
+//     if (normalizedLine !== rawFirst) {
+//       isProgrammaticUpdate = true;// 把首行改回以 '### ' 开头
+//       try {
+//         textarea.value = setFirstLine(value, normalizedLine);
+//       } finally {
+//         isProgrammaticUpdate = false;
+//       }
+//     }
+//     const lastTitle = lastTitleMap.get(textarea) ?? "";// —— 2) 如标题内容有变化，则同步到其他两个 —— //
+//     if (currentTitle !== lastTitle) {
+//       lastTitleMap.set(textarea, currentTitle);// 更新自身记录
+//       syncOthers(textarea, currentTitle);
+//     }
+
+//     let btn = document.getElementById("tab-btn-lesson");
+//     if (CURRENT.active.lesson != document.getElementById("editor-lesson").value){
+//       btn.innerText = AddModifiedStat(btn.innerText)
+//     }else{
+//       btn.innerText = ClearModifiedStat(btn.innerText)
+//     }
+//     btn = document.getElementById("tab-btn-prompt");
+//     if (CURRENT.active.prompt != document.getElementById("editor-prompt").value){
+//         btn.innerText = AddModifiedStat(btn.innerText)
+//     }else{
+//         btn.innerText = ClearModifiedStat(btn.innerText)
+//     }
+//     btn = document.getElementById("tab-btn-score");
+//     if (CURRENT.active.score != document.getElementById("editor-score").value){
+//         btn.innerText = AddModifiedStat(btn.innerText)
+//     }else{
+//         btn.innerText = ClearModifiedStat(btn.innerText)
+//     }
+//   });
+// });
 
 
-  // 把“某个步骤”对应的三个片段载入到三个编辑器
+// 把“某个步骤”对应的三个片段载入到三个编辑器
 function loadStepToEditors(phaseText, stepText) {
   // 三份文档里都取对应 phase/step 的片段（不存在则回退）
   const L = CURRENT.parsed.lesson, P = CURRENT.parsed.prompt, S = CURRENT.parsed.score;
@@ -918,9 +1067,9 @@ function loadStepToEditors(phaseText, stepText) {
   const pText = sliceSection(subP, stepText, 3) || promptPhase;
   const sText = sliceSection(subS, stepText, 3) || scorePhase;
 
-  document.getElementById('editor-lesson').value = lText;
-  document.getElementById('editor-prompt').value = pText;
-  document.getElementById('editor-score').value  = sText;
+  editors['editor-lesson'].value(lText);
+  editors['editor-prompt'].value(pText);
+  editors['editor-score'].value(sText);
 
   CURRENT.active={ //保存打开时的三个文本
     phase:phaseText,
@@ -938,16 +1087,32 @@ function loadStepToEditors(phaseText, stepText) {
 
 }
 
-  // Tab 切换
-  document.addEventListener('click', (e)=>{
-    if (e.target.classList.contains('tab-btn')) {
-      document.querySelectorAll('.tab-btn').forEach(b=>b.classList.remove('active'));
-      e.target.classList.add('active');
-      const id = e.target.dataset.target;
-      document.querySelectorAll('.tab').forEach(t=>t.classList.remove('active'));
-      document.getElementById(id).classList.add('active');
-    }
-  });
+document.addEventListener('click', (e) => {
+  if (e.target.classList.contains('tab-btn')) {
+    document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
+    e.target.classList.add('active');
+
+    const id = e.target.dataset.target;
+    document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));
+    document.getElementById(id).classList.add('active');
+
+    // 广播 tab 变更（告诉别人当前激活的 tab id / 以及要用哪个 editorId）
+    const editorIdMap = {
+      'tab-lesson' : 'editor-lesson',
+      'tab-prompt' : 'editor-prompt',
+      'tab-score'  : 'editor-score',
+    };
+    const activeBtnId = e.target.id; // 如 'tab-btn-lesson'
+    const editorId =
+      activeBtnId === 'tab-btn-lesson' ? 'editor-lesson' :
+      activeBtnId === 'tab-btn-prompt' ? 'editor-prompt' :
+      'editor-score';
+
+    document.dispatchEvent(new CustomEvent('tab:change', {
+      detail: { tabId: id, editorId }
+    }));
+  }
+});
   
   // 保存全部：将三个编辑器中的文本保存回相应的 markdown 文件
   document.getElementById('save-all-btn')?.addEventListener('click', async () => {
diff --git a/Html/apps/static/js/lesson_markdown.js b/Html/apps/static/js/lesson_markdown.js
new file mode 100644
index 0000000..1139738
--- /dev/null
+++ b/Html/apps/static/js/lesson_markdown.js
@@ -0,0 +1,198 @@
+const editors = {}; // id -> EasyMDE
+(function(){
+  // ====== 配置：图片上传接口 ======
+  const UPLOAD_URL = '/api/upload'; // 返回 { url: 'https://...' }
+
+  // ====== Markdown 渲染器 ======
+  const md = window.markdownit({
+    html: false,         // 禁止原生HTML，安全些（如需支持可设为 true）
+    linkify: true,
+    typographer: true,
+    breaks: true
+  });
+
+  const $preview = document.getElementById('md-preview');
+
+  // ====== 三个 textarea 的 EasyMDE 实例 ======
+  const textareas = [
+    { id: 'editor-lesson', tabBtnId: 'tab-btn-lesson' },
+    { id: 'editor-prompt', tabBtnId: 'tab-btn-prompt' },
+    { id: 'editor-score',  tabBtnId: 'tab-btn-score'  },
+  ];
+  
+  let activeId = 'editor-lesson'; // 默认激活
+
+  // 工具：将 Markdown 渲染到右侧预览
+  const renderToPreview = (markdownStr) => {
+    const rawHtml = md.render(markdownStr || '');
+    const safe = DOMPurify.sanitize(rawHtml);
+    $preview.innerHTML = safe;
+  };
+
+  // 工具：节流/防抖
+  function debounce(fn, delay){
+    let t; 
+    return function(...args){
+      clearTimeout(t);
+      t = setTimeout(()=>fn.apply(this,args), delay);
+    }
+  }
+  const debouncedPreview = debounce(renderToPreview, 120);
+
+  // 工具：插入文本到当前光标
+  function insertAtCursor(cm, text){
+    const doc = cm.getDoc();
+    const cursor = doc.getCursor();
+    doc.replaceRange(text, cursor);
+  }
+
+  // 图片上传：给粘贴/拖拽/按钮选择共用
+  async function uploadFile(file){
+    const form = new FormData();
+    form.append('file', file);
+    const { data } = await axios.post(UPLOAD_URL, form, {
+      headers: { 'Content-Type': 'multipart/form-data' }
+    });
+    if(!data || !data.url){
+      throw new Error('上传返回缺少 url 字段');
+    }
+    return data.url;
+  }
+
+  // 为一个 EasyMDE 实例注入图片粘贴/拖拽/按钮上传
+  function bindImageHandlers(easy){
+    const cm = easy.codemirror;
+
+    // 1) 粘贴图片
+    cm.on('paste', async (cmInst, e)=>{
+      const items = (e.clipboardData || e.originalEvent?.clipboardData)?.items || [];
+      for(const it of items){
+        if(it.kind === 'file'){
+          const file = it.getAsFile();
+          if(file && file.type.startsWith('image/')){
+            e.preventDefault();
+            try{
+              const url = await uploadFile(file);
+              insertAtCursor(cmInst, `![image](${url})`);
+            }catch(err){
+              console.error(err);
+              alert('图片上传失败，请重试');
+            }
+          }
+        }
+      }
+    });
+
+    // 2) 拖拽图片
+    easy.codemirror.getWrapperElement().addEventListener('drop', async (e)=>{
+      const files = e.dataTransfer?.files || [];
+      if(!files.length) return;
+      const img = Array.from(files).find(f=>f.type.startsWith('image/'));
+      if(!img) return;
+      e.preventDefault();
+      try{
+        const url = await uploadFile(img);
+        insertAtCursor(cm, `![image](${url})`);
+      }catch(err){
+        console.error(err);
+        alert('图片上传失败，请重试');
+      }
+    });
+
+    // 3) 工具栏“上传图片”按钮：使用隐藏 input[type=file]
+    const fileInput = document.createElement('input');
+    fileInput.type = 'file';
+    fileInput.accept = 'image/*';
+    fileInput.style.display = 'none';
+    fileInput.addEventListener('change', async ()=>{
+      const file = fileInput.files?.[0];
+      if(!file) return;
+      try{
+        const url = await uploadFile(file);
+        insertAtCursor(cm, `![image](${url})`);
+      }catch(err){
+        console.error(err);
+        alert('图片上传失败，请重试');
+      }finally{
+        fileInput.value = '';
+      }
+    });
+    document.body.appendChild(fileInput);
+
+    // 将 input 触发器挂到 toolbar 按钮上（下面初始化里有 name: 'upload-image'）
+    easy.toolbar?.forEach(btn=>{
+      if(btn?.name === 'upload-image'){
+        btn.action = () => fileInput.click();
+      }
+    });
+  }
+
+  // 创建并初始化一个 EasyMDE
+  function createMDEFor(textareaId){
+    const el = document.getElementById(textareaId);
+    if(!el) return null;
+
+    const mde = new EasyMDE({
+      element: el,
+      autoDownloadFontAwesome: false,
+      spellChecker: false,
+      status: false,
+      autofocus: textareaId === activeId,
+      minHeight: '100%',
+      renderingConfig: { singleLineBreaks: false },
+      uploadImage: false, // 我们自定义上传
+      toolbar: [
+        'bold','italic','heading','|',
+        'quote','unordered-list','ordered-list','table','|',
+        'code','link',
+        { name:'upload-image', action:null, className:'fa fa-image', title:'插入图片（上传）' },
+        '|','preview','side-by-side','fullscreen',
+        '|','guide'
+      ],
+      // 保证 textarea 同步（默认就会同步 value；保存时你的原逻辑仍可读取）
+      forceSync: true
+    });
+
+    // 内容变化 -> 刷新预览（仅激活编辑器触发）
+    mde.codemirror.on('change', ()=>{
+      if(textareaId === activeId){
+        debouncedPreview(mde.value());
+      }
+    });
+
+    bindImageHandlers(mde);
+    return mde;
+  }
+
+  // 初始化三个编辑器
+  for(const t of textareas){
+    editors[t.id] = createMDEFor(t.id);
+  }
+
+  // 初次渲染预览
+  debouncedPreview(editors[activeId]?.value() || '');
+
+  // 监听 Tab 切换按钮，让预览跟随当前激活编辑器
+  function setActiveEditor(id){
+    activeId = id;
+    // 确保 EasyMDE 的编辑区获得焦点（可选）
+    const ed = editors[id];
+    if(ed){
+      ed.codemirror.refresh();
+      ed.codemirror.focus();
+      renderToPreview(ed.value());
+    }
+  }
+    document.addEventListener('tab:change', (e) => {
+    const { editorId } = e.detail || {};
+    if (editorId) setActiveEditor(editorId);
+    });
+
+  // 如果你已有 tab 切换逻辑（例如给 .tab-btn 切换 active 类），保留原逻辑即可；
+  // 我们只需在切换时调用 setActiveEditor 对齐预览内容。
+})();
+
+
+
+
+
diff --git a/Html/apps/templates/lesson.html b/Html/apps/templates/lesson.html
index a443a5b..c60f2fb 100644
--- a/Html/apps/templates/lesson.html
+++ b/Html/apps/templates/lesson.html
@@ -4,17 +4,26 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>课时编辑</title>
+
     <link rel="stylesheet" href="/static/css/teacherboard.css">
     <link rel="stylesheet" href="/static/css/dashboard.css">
     <link rel="stylesheet" href="/static/css/lesson.css">
     <link rel="stylesheet" href="/static/css/teacher_course_setting.css">
     <link rel="stylesheet" href="/static/css/lesson_setting.css">
     <link rel="stylesheet" href="/static/css/modelinput.css">
-    
 
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
     <script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
     <script src="/static/js/modelinput.js"></script>
+    <!-- Markdown Editor (EasyMDE) -->
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/easymde/dist/easymde.min.css" />
+    <script src="https://cdn.jsdelivr.net/npm/easymde/dist/easymde.min.js"></script>
+
+    <!-- Markdown 渲染与安全 -->
+    <script src="https://cdn.jsdelivr.net/npm/markdown-it/dist/markdown-it.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/dompurify@3.1.7/dist/purify.min.js"></script>
+    <link rel="stylesheet" href="/static/css/lesson_markdown.css">
+
 </head>
 <body >
     {% include 'navbar.html' %}  <!-- 引入navbar.html -->
@@ -74,6 +83,9 @@
         <div id="tab-score" class="tab">
           <textarea id="editor-score" data-type="score"></textarea>
         </div>
+        <aside class="md-preview-pane" id="md-preview">
+          <div style="color:#64748b">预览区域会实时渲染当前激活的编辑器内容…</div>
+        </aside>
       </div>
     </main>
   </div>
@@ -81,7 +93,9 @@
     <script src="/static/js/course_current.js"></script>
     <script src="/static/js/teacherboard.js"></script>
     <script src="/static/js/teacher_course_setting.js"></script>
+    <script src="/static/js/lesson_markdown.js"></script>
     <script src="/static/js/lesson.js"></script>
+
     <script>
       window.lesson = {{ lesson|tojson|safe }};
       window.chapter = {{ chapter|tojson|safe }};
diff --git a/Html/apps/templates/navbar.html b/Html/apps/templates/navbar.html
index bc8e2fd..788d97d 100644
--- a/Html/apps/templates/navbar.html
+++ b/Html/apps/templates/navbar.html
@@ -1,6 +1,6 @@
 <link rel="stylesheet" href="/static/css/navbar.css">
     <!-- Bootstrap 5 CSS -->
-    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet">
+    <!-- <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet"> -->
     <!-- Font Awesome 图标 -->
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css">
     <link rel="stylesheet" href="/static/css/dashboard.css">
diff --git a/Html/apps/views/lessons.py b/Html/apps/views/lessons.py
index 36a3d5a..600647c 100644
--- a/Html/apps/views/lessons.py
+++ b/Html/apps/views/lessons.py
@@ -5,9 +5,18 @@ from bson import ObjectId
 from datetime import datetime
 from ..auth.decorators import require_role
 from ..services.course_service import load_material,save_materials_markdown_cos
+from ..services.cos_service import upload_file
+import uuid
 
 bp = Blueprint('lesson', __name__)
 
+@bp.route("/api/upload", methods=["POST"])
+def upload():
+    f = request.files['file']
+    url = upload_file(f, "image_" + str(uuid.uuid4()))
+    return jsonify({"url": url})
+
+
 # 返回课时元信息（含三份 markdown 的可访问链接或直接内容）
 @bp.route('/api/materials/<material_id>/chapters/<chapter_name>/lessons/<lesson_name>', methods=['GET'])
 @require_role(roles="teacher")