diff --git a/app/src/main/java/io/legado/app/help/book/BookExtensions.kt b/app/src/main/java/io/legado/app/help/book/BookExtensions.kt
index d1f0e9c83..db5788e36 100644
--- a/app/src/main/java/io/legado/app/help/book/BookExtensions.kt
+++ b/app/src/main/java/io/legado/app/help/book/BookExtensions.kt
@@ -206,17 +206,17 @@ fun Book.isSameNameAuthor(other: Any?): Boolean {
     return false
 }
 
-fun Book.getExportFileName(): String {
+fun Book.getExportFileName(suffix: String): String {
     val jsStr = AppConfig.bookExportFileName
     if (jsStr.isNullOrBlank()) {
-        return "${name} 作者：${getRealAuthor()}"
+        return "${name} 作者：${getRealAuthor()}.$suffix"
     }
     val bindings = SimpleBindings()
     bindings["name"] = name
     bindings["author"] = getRealAuthor()
     return kotlin.runCatching {
-        AppConst.SCRIPT_ENGINE.eval(jsStr, bindings).toString()
+        AppConst.SCRIPT_ENGINE.eval(jsStr, bindings).toString() + "." + suffix
     }.onFailure {
         AppLog.put("导出书名规则错误,使用默认规则\n${it.localizedMessage}", it)
-    }.getOrDefault("${name} 作者：${getRealAuthor()}")
+    }.getOrDefault("${name} 作者：${getRealAuthor()}.$suffix")
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt b/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
index 666b223a7..fb6911345 100644
--- a/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
@@ -9,10 +9,8 @@ import androidx.lifecycle.MutableLiveData
 import com.bumptech.glide.Glide
 import com.bumptech.glide.request.target.CustomTarget
 import com.bumptech.glide.request.transition.Transition
-import com.script.SimpleBindings
 import io.legado.app.R
 import io.legado.app.base.BaseViewModel
-import io.legado.app.constant.AppConst
 import io.legado.app.constant.AppLog
 import io.legado.app.constant.AppPattern
 import io.legado.app.data.appDb
@@ -22,6 +20,7 @@ import io.legado.app.exception.NoStackTraceException
 import io.legado.app.help.AppWebDav
 import io.legado.app.help.book.BookHelp
 import io.legado.app.help.book.ContentProcessor
+import io.legado.app.help.book.getExportFileName
 import io.legado.app.help.book.isLocal
 import io.legado.app.help.config.AppConfig
 import io.legado.app.help.coroutine.Coroutine
@@ -78,23 +77,8 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
         }
     }
 
-    private fun getExportFileName(book: Book): String {
-        val jsStr = AppConfig.bookExportFileName
-        if (jsStr.isNullOrBlank()) {
-            return "${book.name} 作者：${book.getRealAuthor()}"
-        }
-        val bindings = SimpleBindings()
-        bindings["name"] = book.name
-        bindings["author"] = book.getRealAuthor()
-        return kotlin.runCatching {
-            AppConst.SCRIPT_ENGINE.eval(jsStr, bindings).toString()
-        }.onFailure {
-            context.toastOnUi("书名规则错误\n${it.localizedMessage}")
-        }.getOrDefault("${book.name} 作者：${book.getRealAuthor()}")
-    }
-
     fun exportFileExist(path: String, book: Book): Boolean {
-        val fileName = getExportFileName(book)
+        val fileName = book.getExportFileName("txt")
         return if (path.isContentScheme()) {
             val uri = Uri.parse(path)
             val doc = DocumentFile.fromTreeUri(context, uri) ?: return false
@@ -141,7 +125,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
 
     @Suppress("BlockingMethodInNonBlockingContext")
     private suspend fun export(doc: DocumentFile, book: Book) {
-        val filename = "${getExportFileName(book)}.txt"
+        val filename = book.getExportFileName("txt")
         DocumentUtils.delete(doc, filename)
         val bookDoc = DocumentUtils.createFileIfNotExist(doc, filename)
             ?: throw NoStackTraceException("创建文档失败，请尝试重新设置导出文件夹")
@@ -167,7 +151,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
     }
 
     private suspend fun export(file: File, book: Book) {
-        val filename = "${getExportFileName(book)}.txt"
+        val filename = book.getExportFileName("txt")
         val bookPath = FileUtils.getPath(file, filename)
         val bookFile = FileUtils.createFileWithReplace(bookPath)
         getAllContents(book) { text, srcList ->
@@ -305,7 +289,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
 
     @Suppress("BlockingMethodInNonBlockingContext")
     private suspend fun exportEpub(doc: DocumentFile, book: Book) {
-        val filename = "${getExportFileName(book)}.epub"
+        val filename = book.getExportFileName("epub")
         DocumentUtils.delete(doc, filename)
         val epubBook = EpubBook()
         epubBook.version = "2.0"
@@ -331,7 +315,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
 
 
     private suspend fun exportEpub(file: File, book: Book) {
-        val filename = "${getExportFileName(book)}.epub"
+        val filename = book.getExportFileName("epub")
         val epubBook = EpubBook()
         epubBook.version = "2.0"
         //set metadata
diff --git a/app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt b/app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt
index f73591327..3172cc89f 100644
--- a/app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt
@@ -297,9 +297,10 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
     @Suppress("BlockingMethodInNonBlockingContext")
     fun importBook(file: File, success: ((Book) -> Unit)? = null) {
         execute {
+            val suffix = file.name.substringAfterLast(".")
             LocalBook.saveBookFile(
                 FileInputStream(file),
-                bookData.value!!.getExportFileName()
+                bookData.value!!.getExportFileName(suffix)
             )
         }.onSuccess {
             val book = changeToLocalBook(LocalBook.importFile(it))