diff --git a/src/modules/create_pdf.py b/src/modules/create_pdf.py
index 1deada6..2414759 100644
--- a/src/modules/create_pdf.py
+++ b/src/modules/create_pdf.py
@@ -4,12 +4,12 @@
 
 import os
 
+from concurrent.futures import ProcessPoolExecutor
+
 import img2pdf
 
 from .link_parse import Link, LinkFile
 
-from concurrent.futures import ProcessPoolExecutor
-
 
 class CreatePDF:
     """Merge the images of books into PDF files
@@ -18,8 +18,9 @@ class CreatePDF:
         - links (list[Link]): The list of links object
     """
 
-    def __init__(self, links: list[Link]) -> None:
+    def __init__(self, links: list[Link], download_directory: str) -> None:
         self.links: list[Link] = links
+        self.download_directory: str = download_directory
 
     @staticmethod
     def merge_jpg_to_pdf_page_link_or_preview_link(
@@ -61,8 +62,7 @@ def merge_jpg_to_pdf_book_link(book_directory: str, link: Link) -> None:
                     link_page,
                 )
 
-    @staticmethod
-    def create_pdf(dowload_directory: str, links: list[Link]) -> None:
+    def create_pdf(self) -> None:
         """
         For each subdirectory in a directory, if there are JPG images, merge them into a single PDF.
         If there are no JPG images, use the merge_jpg_to_pdf_book_link function.
@@ -71,12 +71,12 @@ def create_pdf(dowload_directory: str, links: list[Link]) -> None:
             directory (str): The directory containing the subdirectories.
             links (list[Link]): list of Link
         """
-        for link in links:
+        for link in self.links:
             if link.original_type == "book":
                 CreatePDF.merge_jpg_to_pdf_book_link(
-                    os.path.join(dowload_directory, link.name), link
+                    os.path.join(self.download_directory, link.name), link
                 )
             else:
                 CreatePDF.merge_jpg_to_pdf_page_link_or_preview_link(
-                    os.path.join(dowload_directory, link.name), link.files[0]
+                    os.path.join(self.download_directory, link.name), link.files[0]
                 )