Seats on China Railways trains are pre-assigned, and all changes are not permitted once a booking is confirmed.
The system automatically selects the best available seats at the time of booking, and specific seat locations cannot be requested.
In cases where ticket availability is limited, the system will assign the closest available seats to ensure accommodation.
If you require any changes to your booking, you must cancel the current ticket in accordance with the applicable cancellation policy and proceed with making a new reservation.