diff --git a/app/src/main/java/io/legado/app/service/help/ReadBook.kt b/app/src/main/java/io/legado/app/service/help/ReadBook.kt
index 8de4c7ab9..0ab59ad5e 100644
--- a/app/src/main/java/io/legado/app/service/help/ReadBook.kt
+++ b/app/src/main/java/io/legado/app/service/help/ReadBook.kt
@@ -3,6 +3,7 @@ package io.legado.app.service.help
 import androidx.lifecycle.MutableLiveData
 import io.legado.app.App
 import io.legado.app.R
+import io.legado.app.constant.BookType
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookChapter
 import io.legado.app.help.BookHelp
@@ -34,6 +35,20 @@ object ReadBook {
     var webBook: WebBook? = null
     private val loadingChapters = arrayListOf<Int>()
 
+    fun resetData(book: Book) {
+        this.book = book
+        titleDate.postValue(book.name)
+        durChapterIndex = book.durChapterIndex
+        durPageIndex = book.durChapterPos
+        isLocalBook = book.origin == BookType.local
+        App.db.bookSourceDao().getBookSource(book.origin)?.let {
+            webBook = WebBook(it)
+        }
+        chapterSize = 0
+        prevTextChapter = null
+        curTextChapter = null
+        nextTextChapter = null
+    }
 
     fun moveToNextChapter(upContent: Boolean): Boolean {
         if (durChapterIndex < chapterSize - 1) {
@@ -138,7 +153,7 @@ object ReadBook {
         }
     }
 
-    fun download(index: Int) {
+    private fun download(index: Int) {
         book?.let { book ->
             if (addLoading(index)) {
                 Coroutine.async {
@@ -156,7 +171,7 @@ object ReadBook {
         }
     }
 
-    fun download(chapter: BookChapter) {
+    private fun download(chapter: BookChapter) {
         book?.let { book ->
             webBook?.getContent(book, chapter)
                 ?.onSuccess(Dispatchers.IO) { content ->
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
index 295de74a8..823c74b82 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
@@ -5,7 +5,6 @@ import android.content.Intent
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.BaseViewModel
-import io.legado.app.constant.BookType
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookChapter
 import io.legado.app.help.BookHelp
@@ -34,30 +33,38 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
     }
 
     private fun initBook(book: Book) {
-        ReadBook.book = book
-        ReadBook.titleDate.postValue(book.name)
-        ReadBook.durChapterIndex = book.durChapterIndex
-        ReadBook.durPageIndex = book.durChapterPos
-        ReadBook.isLocalBook = book.origin == BookType.local
-        App.db.bookSourceDao().getBookSource(book.origin)?.let {
-            ReadBook.webBook = WebBook(it)
-        }
-        val count = App.db.bookChapterDao().getChapterCount(book.bookUrl)
-        if (count == 0) {
-            if (book.tocUrl.isEmpty()) {
-                loadBookInfo(book)
+        if (ReadBook.book?.bookUrl != book.bookUrl) {
+            ReadBook.resetData(book)
+            val count = App.db.bookChapterDao().getChapterCount(book.bookUrl)
+            if (count == 0) {
+                if (book.tocUrl.isEmpty()) {
+                    loadBookInfo(book)
+                } else {
+                    loadChapterList(book)
+                }
             } else {
-                loadChapterList(book)
+                if (ReadBook.durChapterIndex > count - 1) {
+                    ReadBook.durChapterIndex = count - 1
+                }
+                ReadBook.chapterSize = count
+                ReadBook.callBack?.loadContent()
+            }
+            if (ReadBook.inBookshelf) {
+                ReadBook.saveRead()
             }
         } else {
-            if (ReadBook.durChapterIndex > count - 1) {
-                ReadBook.durChapterIndex = count - 1
+            ReadBook.titleDate.postValue(book.name)
+            if (ReadBook.chapterSize == 0) {
+                if (book.tocUrl.isEmpty()) {
+                    loadBookInfo(book)
+                } else {
+                    loadChapterList(book)
+                }
+            } else {
+                if (ReadBook.curTextChapter != null) {
+                    ReadBook.callBack?.upContent()
+                }
             }
-            ReadBook.chapterSize = count
-            ReadBook.callBack?.loadContent()
-        }
-        if (ReadBook.inBookshelf) {
-            ReadBook.saveRead()
         }
     }