2. After the user logs in, click the ticket booking option. In the ticket booking option, check the word round trip in the front position, and set the booking round trip date first.
Next, you need to book the departure and return trains respectively. Click Query, select the train number and make a reservation.
4. After two tickets are booked separately, the user can pay two tickets in a unified way, and only need to pay the total amount.
5. After completing the above operations, as long as the payment is completed, the operation of booking round-trip train tickets can be successfully implemented.