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 7a60235e8..6178653ca 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
@@ -241,9 +241,10 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
     ) {
         execute(scope) {
             webFiles.clear()
-            val fileName = "${book.name} 作者：${book.author}"
+            val fileNameExcludeExtension = if (book.author.isBlank()) book.name else "${book.name} 作者：${book.author}"
             book.downloadUrls!!.map {
-                val mFileName = UrlUtil.getFileName(AnalyzeUrl(it, source = bookSource)) ?: fileName
+                val analyzeUrl = AnalyzeUrl(it, source = bookSource)
+                val mFileName = UrlUtil.getFileName(analyzeUrl) ?: "${fileNameExcludeExtension}.${analyzeUrl.type}"
                 WebFile(it, mFileName)
             }
         }.onError {