diff --git a/app/src/main/java/io/legado/app/data/dao/BookChapterDao.kt b/app/src/main/java/io/legado/app/data/dao/BookChapterDao.kt
index fdbff2bf1..8ed58cadf 100644
--- a/app/src/main/java/io/legado/app/data/dao/BookChapterDao.kt
+++ b/app/src/main/java/io/legado/app/data/dao/BookChapterDao.kt
@@ -25,4 +25,8 @@ interface BookChapterDao {
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insert(vararg bookChapter: BookChapter)
 
+
+    @Query("delete from chapters where bookUrl = :bookUrl")
+    fun delByBook(bookUrl: String)
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt b/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt
index 463c0b015..b1fd24966 100644
--- a/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt
@@ -39,14 +39,18 @@ class BookshelfViewModel(application: Application) : BaseViewModel(application)
                             updateList.add(book.bookUrl)
                             postEvent(Bus.UP_BOOK, book.bookUrl)
                         }
-                        WebBook(bookSource).getChapterList(book).onSuccess(IO) {
+                        WebBook(bookSource).getChapterList(book)
+                            .onSuccess(IO) {
                             it?.let {
                                 App.db.bookDao().update(book)
-                                if (it.size > App.db.bookChapterDao().getChapterCount(book.bookUrl)) {
-                                    App.db.bookChapterDao().insert(*it.toTypedArray())
-                                }
+                                App.db.bookChapterDao().delByBook(book.bookUrl)
+                                App.db.bookChapterDao().insert(*it.toTypedArray())
                             }
-                        }.onFinally {
+                            }
+                            .onError {
+                                it.printStackTrace()
+                            }
+                            .onFinally {
                             synchronized(this) {
                                 updateList.remove(book.bookUrl)
                                 postEvent(Bus.UP_BOOK, book.bookUrl)