Open itunes, connect your phone, and select Books for your phone. First import the e-book into itunes, then click "Synchronize Books", select "All Books", and finally click the application below to complete the import.

2. Use third-party software for operation, such as itools, 9 1 assistant, etc. These methods are as follows:

Open itools, click ibooks on your mobile phone, click Books-Import-Add in turn, select the e-book to import in the pop-up window, and then click Import to complete the book import.