diff --git a/app/src/main/java/io/legado/app/model/localBook/BaseLocalBookParse.kt b/app/src/main/java/io/legado/app/model/localBook/BaseLocalBookParse.kt
new file mode 100644
index 000000000..8d59bfc23
--- /dev/null
+++ b/app/src/main/java/io/legado/app/model/localBook/BaseLocalBookParse.kt
@@ -0,0 +1,21 @@
+package io.legado.app.model.localBook
+
+import io.legado.app.data.entities.Book
+import io.legado.app.data.entities.BookChapter
+import java.io.InputStream
+
+/**
+ *companion object interface
+ *see EpubFile.kt
+ */
+interface BaseLocalBookParse {
+
+    fun upBookInfo(book: Book)
+
+    fun getChapterList(book: Book): ArrayList<BookChapter>
+
+    fun getContent(book: Book, chapter: BookChapter): String?
+
+    fun getImage(book: Book, href: String): InputStream?
+
+}
diff --git a/app/src/main/java/io/legado/app/model/localBook/EpubFile.kt b/app/src/main/java/io/legado/app/model/localBook/EpubFile.kt
index 36be77a05..ffdaf89e0 100644
--- a/app/src/main/java/io/legado/app/model/localBook/EpubFile.kt
+++ b/app/src/main/java/io/legado/app/model/localBook/EpubFile.kt
@@ -25,7 +25,7 @@ import java.util.zip.ZipFile
 
 class EpubFile(var book: Book) {
 
-    companion object {
+    companion object : BaseLocalBookParse {
         private var eFile: EpubFile? = null
 
         @Synchronized
@@ -41,17 +41,17 @@ class EpubFile(var book: Book) {
         }
 
         @Synchronized
-        fun getChapterList(book: Book): ArrayList<BookChapter> {
+        override fun getChapterList(book: Book): ArrayList<BookChapter> {
             return getEFile(book).getChapterList()
         }
 
         @Synchronized
-        fun getContent(book: Book, chapter: BookChapter): String? {
+        override fun getContent(book: Book, chapter: BookChapter): String? {
             return getEFile(book).getContent(chapter)
         }
 
         @Synchronized
-        fun getImage(
+        override fun getImage(
             book: Book,
             href: String
         ): InputStream? {
@@ -59,7 +59,7 @@ class EpubFile(var book: Book) {
         }
 
         @Synchronized
-        fun upBookInfo(book: Book) {
+        override fun upBookInfo(book: Book) {
             return getEFile(book).upBookInfo()
         }
     }
diff --git a/app/src/main/java/io/legado/app/model/localBook/README.md b/app/src/main/java/io/legado/app/model/localBook/README.md
new file mode 100644
index 000000000..8f080b25e
--- /dev/null
+++ b/app/src/main/java/io/legado/app/model/localBook/README.md
@@ -0,0 +1,7 @@
+# 本地书籍解析
+
+* BaseLocalBookParse.kt 本地书籍解析接口
+* LocalBook.kt 总入口
+* TextFile.kt 解析txt
+* EpubFile.kt 解析epub
+* UmdFile.kt 解析umd
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/model/localBook/UmdFile.kt b/app/src/main/java/io/legado/app/model/localBook/UmdFile.kt
index 811e65d71..9e1a38b48 100644
--- a/app/src/main/java/io/legado/app/model/localBook/UmdFile.kt
+++ b/app/src/main/java/io/legado/app/model/localBook/UmdFile.kt
@@ -11,7 +11,7 @@ import java.io.File
 import java.io.InputStream
 
 class UmdFile(var book: Book) {
-    companion object {
+    companion object : BaseLocalBookParse {
         private var uFile: UmdFile? = null
 
         @Synchronized
@@ -25,17 +25,17 @@ class UmdFile(var book: Book) {
         }
 
         @Synchronized
-        fun getChapterList(book: Book): ArrayList<BookChapter> {
+        override fun getChapterList(book: Book): ArrayList<BookChapter> {
             return getUFile(book).getChapterList()
         }
 
         @Synchronized
-        fun getContent(book: Book, chapter: BookChapter): String? {
+        override fun getContent(book: Book, chapter: BookChapter): String? {
             return getUFile(book).getContent(chapter)
         }
 
         @Synchronized
-        fun getImage(
+        override fun getImage(
             book: Book,
             href: String
         ): InputStream? {
@@ -44,7 +44,7 @@ class UmdFile(var book: Book) {
 
 
         @Synchronized
-        fun upBookInfo(book: Book) {
+        override fun upBookInfo(book: Book) {
             return getUFile(book).upBookInfo()
         }
     }