diff --git a/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt b/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
index a59b2db5d..75ff48199 100644
--- a/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
+++ b/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
@@ -219,6 +219,8 @@ object LocalBook {
         fileName: String,
         source: BaseSource? = null,
     ): Uri {
+        AppConfig.defaultBookTreeUri
+            ?: throw NoStackTraceException("没有设置书籍保存位置!")
         val bytes = when {
             str.isAbsUrl() -> AnalyzeUrl(str, source = source).getByteArray()
             str.isDataUrl() -> Base64.decode(str.substringAfter("base64,"), Base64.DEFAULT)
@@ -241,7 +243,7 @@ object LocalBook {
         return type ?: fileType
     }
 
-    private fun saveBookFile(
+    fun saveBookFile(
         bytes: ByteArray,
         fileName: String
     ): Uri {
@@ -269,6 +271,26 @@ object LocalBook {
         }
     }
 
+    fun isOnBookShelf(
+        fileName: String
+    ): Boolean {
+        val defaultBookTreeUri = AppConfig.defaultBookTreeUri
+        if (defaultBookTreeUri.isNullOrBlank()) throw NoStackTraceException("没有设置书籍保存位置!")
+        val treeUri = Uri.parse(defaultBookTreeUri)
+        var bookUrl: String = ""
+        if (treeUri.isContentScheme()) {
+            val treeDoc = DocumentFile.fromTreeUri(appCtx, treeUri)
+            var doc = treeDoc!!.findFile(fileName) ?: return false
+            bookUrl = doc.uri.toString()
+        } else {
+            val treeFile = File(treeUri.path!!)
+            val file = treeFile.getFile(fileName)
+            if (!file.exists()) return false
+            bookUrl = file.absolutePath
+        }
+        return appDb.bookDao.getBook(bookUrl) != null
+    }
+
     //文件类书源 合并在线书籍信息 在线 > 本地
     fun mergeBook(localBook: Book, onLineBook: Book?): Book {
         onLineBook ?: return localBook
diff --git a/app/src/main/java/io/legado/app/ui/book/remote/RemoteBook.kt b/app/src/main/java/io/legado/app/ui/book/remote/RemoteBook.kt
index c04098421..b0a45c332 100644
--- a/app/src/main/java/io/legado/app/ui/book/remote/RemoteBook.kt
+++ b/app/src/main/java/io/legado/app/ui/book/remote/RemoteBook.kt
@@ -5,5 +5,6 @@ data class RemoteBook(
     val urlName: String,
     val size: Long,
     val contentType: String,
-    val lastModify: Long
+    val lastModify: Long,
+    val isOnBookShelf: Boolean
 )
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/book/remote/RemoteBookManager.kt b/app/src/main/java/io/legado/app/ui/book/remote/RemoteBookManager.kt
index 9fd1d1faf..132c6f354 100644
--- a/app/src/main/java/io/legado/app/ui/book/remote/RemoteBookManager.kt
+++ b/app/src/main/java/io/legado/app/ui/book/remote/RemoteBookManager.kt
@@ -2,11 +2,8 @@ package io.legado.app.ui.book.remote
 
 import android.net.Uri
 
-
-
 abstract class RemoteBookManager {
     protected val remoteBookFolder : String = "books"
-    protected val contentTypeList: ArrayList<String> = arrayListOf("epub","txt")
     abstract suspend fun initRemoteContext()
     abstract suspend fun getRemoteBookList(): MutableList<RemoteBook>
     abstract suspend fun upload(localBookUri: Uri): Boolean
@@ -15,5 +12,5 @@ abstract class RemoteBookManager {
     /**
      * @return String：下载到本地的路径
      */
-    abstract suspend fun getRemoteBook(remoteBook: RemoteBook): String?
+    abstract suspend fun getRemoteBook(remoteBook: RemoteBook): Uri?
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/book/remote/RemoteBookViewModel.kt b/app/src/main/java/io/legado/app/ui/book/remote/RemoteBookViewModel.kt
index 87a7eff57..09ecfb18a 100644
--- a/app/src/main/java/io/legado/app/ui/book/remote/RemoteBookViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/remote/RemoteBookViewModel.kt
@@ -73,7 +73,7 @@ class RemoteBookViewModel(application: Application): BaseViewModel(application){
         execute {
             val downloadBookPath = RemoteBookWebDav.getRemoteBook(remoteBook)
             downloadBookPath?.let {
-                LocalBook.importFile(Uri.parse(it))
+                LocalBook.importFile(it)
             }
         }.onFinally {
             finally.invoke()
diff --git a/app/src/main/java/io/legado/app/ui/book/remote/manager/RemoteBookWebDav.kt b/app/src/main/java/io/legado/app/ui/book/remote/manager/RemoteBookWebDav.kt
index 995463f58..fc1293ce7 100644
--- a/app/src/main/java/io/legado/app/ui/book/remote/manager/RemoteBookWebDav.kt
+++ b/app/src/main/java/io/legado/app/ui/book/remote/manager/RemoteBookWebDav.kt
@@ -3,11 +3,13 @@ package io.legado.app.ui.book.remote.manager
 
 import android.net.Uri
 import io.legado.app.constant.PreferKey
+import io.legado.app.constant.AppPattern.bookFileRegex
 import io.legado.app.exception.NoStackTraceException
 import io.legado.app.help.AppWebDav
 import io.legado.app.help.config.AppConfig
 import io.legado.app.lib.webdav.WebDav
 import io.legado.app.lib.webdav.WebDavFile
+import io.legado.app.model.localBook.LocalBook
 import io.legado.app.ui.book.remote.RemoteBook
 import io.legado.app.ui.book.remote.RemoteBookManager
 import io.legado.app.utils.*
@@ -17,7 +19,6 @@ import java.io.File
 
 object RemoteBookWebDav : RemoteBookManager() {
     private val remoteBookUrl get() = "${rootWebDavUrl}${remoteBookFolder}"
-    private val localSaveFolder get() = "${appCtx.externalFiles.absolutePath}${File.separator}${remoteBookFolder}"
 
     init {
         runBlocking {
@@ -68,31 +69,35 @@ object RemoteBookWebDav : RemoteBookManager() {
                 val fileExtension = webDavFileName.substringAfterLast(".")
 
                 //扩展名符合阅读的格式则认为是书籍
-                if (contentTypeList.contains(fileExtension)) {
-                    remoteBooks.add(RemoteBook(webDavFileName,webDavUrlName,webDavFile.size,fileExtension,webDavFile.lastModify))
+                if (bookFileRegex.matches(webDavFileName)) {
+                    val isOnBookShelf = LocalBook.isOnBookShelf(webDavFileName)
+                    remoteBooks.add(
+                        RemoteBook(
+                            webDavFileName, webDavUrlName, webDavFile.size,
+                            fileExtension, webDavFile.lastModify, isOnBookShelf
+                        )
+                    )
                 }
             }
         } ?: throw NoStackTraceException("webDav没有配置")
         return remoteBooks
     }
 
-    override suspend fun getRemoteBook(remoteBook: RemoteBook): String? {
-        val saveFilePath= "${localSaveFolder}${File.separator}${remoteBook.filename}"
-        kotlin.runCatching {
+    override suspend fun getRemoteBook(remoteBook: RemoteBook): Uri? {
+        return kotlin.runCatching {
             AppWebDav.authorization?.let {
-                FileUtils.createFolderIfNotExist(localSaveFolder).run {
-                    val webdav = WebDav(
-                        remoteBook.urlName,
-                        it
-                    )
-                    webdav.downloadTo(saveFilePath, true)
+                val webdav = WebDav(
+                    remoteBook.urlName,
+                    it
+                )
+                webdav.download().let { bytes ->
+                    LocalBook.saveBookFile(bytes, remoteBook.filename)
                 }
             }
         }.onFailure {
             it.printStackTrace()
-            return null
-        }
-        return saveFilePath
+            null
+        }.getOrNull()
     }
 
     /**