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 f1ad589ad..aa1fbb35a 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
@@ -35,6 +35,7 @@ object ReadBook {
 
     fun moveToNextChapter(upContent: Boolean): Boolean {
         if (durChapterIndex < chapterSize - 1) {
+            durPageIndex = 0
             durChapterIndex++
             prevTextChapter = curTextChapter
             curTextChapter = nextTextChapter
@@ -61,6 +62,35 @@ object ReadBook {
         }
     }
 
+    fun moveToPrevChapter(upContent: Boolean, toLast: Boolean): Boolean {
+        if (durChapterIndex > 0) {
+            durPageIndex = if (toLast) prevTextChapter?.lastIndex() ?: 0 else 0
+            durChapterIndex--
+            nextTextChapter = curTextChapter
+            curTextChapter = prevTextChapter
+            prevTextChapter = null
+            book?.let {
+                if (curTextChapter == null) {
+                    loadContent(durChapterIndex)
+                } else if (upContent) {
+                    callBack?.upContent()
+                }
+                loadContent(durChapterIndex.minus(1))
+                GlobalScope.launch(Dispatchers.IO) {
+                    for (i in -5..-2) {
+                        delay(100)
+                        download(durChapterIndex + i)
+                    }
+                }
+            }
+            saveRead()
+            callBack?.curChapterChanged()
+            return true
+        } else {
+            return false
+        }
+    }
+
     fun loadContent(index: Int) {
         book?.let { book ->
             if (addLoading(index)) {
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 44715df78..a36b4756e 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -380,15 +380,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
      * 上一页
      */
     override fun moveToPrevChapter(upContent: Boolean, last: Boolean): Boolean {
-        return if (ReadBook.durChapterIndex > 0) {
-            ReadBook.durPageIndex = if (last) ReadBook.prevTextChapter?.lastIndex() ?: 0 else 0
-            viewModel.moveToPrevChapter(upContent)
-            ReadBook.saveRead()
-            curChapterChanged()
-            true
-        } else {
-            false
-        }
+        return ReadBook.moveToPrevChapter(upContent, last)
     }
 
     override fun clickCenter() {
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 a78949c26..6adc7b7c5 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
@@ -15,8 +15,6 @@ import io.legado.app.service.help.ReadAloud
 import io.legado.app.service.help.ReadBook
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
 class ReadBookViewModel(application: Application) : BaseViewModel(application) {
@@ -100,27 +98,6 @@ class ReadBookViewModel(application: Application) : BaseViewModel(application) {
         }
     }
 
-    fun moveToPrevChapter(upContent: Boolean) {
-        ReadBook.durChapterIndex--
-        ReadBook.nextTextChapter = ReadBook.curTextChapter
-        ReadBook.curTextChapter = ReadBook.prevTextChapter
-        ReadBook.prevTextChapter = null
-        ReadBook.book?.let {
-            if (ReadBook.curTextChapter == null) {
-                ReadBook.loadContent(ReadBook.durChapterIndex)
-            } else if (upContent) {
-                ReadBook.callBack?.upContent()
-            }
-            ReadBook.loadContent(ReadBook.durChapterIndex.minus(1))
-            launch(IO) {
-                for (i in -5..-2) {
-                    delay(100)
-                    ReadBook.download(ReadBook.durChapterIndex + i)
-                }
-            }
-        }
-    }
-
     fun changeTo(book1: Book) {
         execute {
             ReadBook.book?.let {