1. Enter 12306 Railway Booking official website, enter the departure station and terminal station, check the train number, and click "Booking" at the back of the train number.

2. Select the seat type, fill in the passenger information, click "Submit Order", check the information, and then click "Confirm".

3. Enter the unfinished order interface, click "Continue to Pay", enter the expense payment interface, and select "Online Payment".

4. In the online payment interface, select Alipay in the lower right corner and click Enter.

5. Enter the Alipay payment interface and enter the user name and payment password.

6. Enter Alipay, select the credit card bound by Alipay, and click "Next".

7. Enter the payment password again and click "Confirm Payment".

8. Payment was successful. Click "Payment Complete".