2. Click the icon in the upper left corner of iTunes, and then select "Add file to library".
3. Select the file to import in the pop-up window.
4. Then return to the main interface, click the logo with the mobile phone icon to enter the control interface.
5. Click "Books" on the left, then select "Synchronize Books", select the name of the book to be imported, and click the "Synchronize" button in the lower right corner.
6. After the synchronization is completed, open the ibook application in the mobile phone and you can see the newly imported books.