diff --git a/README.md b/README.md
index 8e6c9fa..7706237 100644
--- a/README.md
+++ b/README.md
@@ -288,4 +288,3 @@ python app.py
 
 - **[lumina](https://github.com/MilkFeng/lumina)**
 - **[NLCISBNPlugin](https://github.com/DoiiarX/NLCISBNPlugin)**
-
diff --git a/lib/pages/epub_reader/epub_detail_page.dart b/lib/pages/epub_reader/epub_detail_page.dart
index 3217c1a..79dae09 100644
--- a/lib/pages/epub_reader/epub_detail_page.dart
+++ b/lib/pages/epub_reader/epub_detail_page.dart
@@ -842,7 +842,26 @@ class _EpubDetailPageState extends State<EpubDetailPage> {
                 decoration: BoxDecoration(color: colors.surfaceContainerHighest, borderRadius: BorderRadius.circular(10)),
                 child: Icon(Icons.link_off, size: 18, color: colors.error)),
             title: Text('取消关联', style: TextStyle(fontSize: 13, color: colors.error)),
-            onTap: () { Navigator.pop(ctx); _unlinkBook(); },
+            onTap: () {
+              Navigator.pop(ctx);
+              showDialog(
+                context: context,
+                builder: (confirmCtx) => AlertDialog(
+                  title: const Text('取消关联', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
+                  content: Text(
+                    '取消关联会清除掉阅读界面的蓝色划线且重新关联后不可恢复，确定要取消关联吗？',
+                    style: TextStyle(fontSize: 14, color: colors.onSurface.withValues(alpha: 0.6)),
+                  ),
+                  actions: [
+                    TextButton(onPressed: () => Navigator.pop(confirmCtx), child: Text('取消', style: TextStyle(color: colors.onSurface.withValues(alpha: 0.4)))),
+                    TextButton(
+                      onPressed: () { Navigator.pop(confirmCtx); _unlinkBook(); },
+                      child: Text('确定', style: TextStyle(color: colors.error, fontWeight: FontWeight.w600)),
+                    ),
+                  ],
+                ),
+              );
+            },
           ),
           const SizedBox(height: 8),
         ]),
diff --git a/lib/utils/epub/reader_dao.dart b/lib/utils/epub/reader_dao.dart
index 92f69a3..b296da4 100644
--- a/lib/utils/epub/reader_dao.dart
+++ b/lib/utils/epub/reader_dao.dart
@@ -88,6 +88,12 @@ class ReaderDao {
   /// 取消关联
   Future<int> unlinkBook(String readerBookId) async {
     final db = await _db.database;
+    // 同步删除该书的摘抄蓝色高亮标注
+    await db.delete(
+      'book_annotations',
+      where: 'book_id = ? AND color = ?',
+      whereArgs: [readerBookId, 'excerpt'],
+    );
     return db.update(
       'reader_books',
       {'book_id': '', 'updated_at': DateTime.now().toIso8601String()},