The kindle software of the mobile phone and the account in the kindle e-book reader must be consistent to synchronize. Method 1: Import 1 with USB data cable, and connect kindle and computer with data cable. The first connection has a minute-driven installation process. 2. Click the Open Hard Disk button, view the Documents options, and then click Open. 3. Paste the file to be imported directly into the folder. Pay attention to the format. Method 2: To push each kindle device with Amazon account, you need to register and log in to an account. This account is a link to realize multi-terminal synchronization. Go to Amazon official website, find the kindle that manages me under my account, and you can view your push account in your personal document settings.