How to buy train tickets online is as follows: Materials: Mobile phone: Xiaomi 8 version: miui11.0.4, software: WeChat version: 7.0.101. First, we enter WeChat, and then click Pay in the My interface options. 2. After entering the payment options, scroll down to see the train ticket option. Click on the train ticket option. 3. Then select the station you want to depart from and arrive at, and then click on the train ticket to query. 4. After entering the train ticket inquiry, click on the flight you want to take. 5. After entering the flight you want to take, click on the seat you want to choose, whether to choose a sleeper berth or a hard seat. 6. After selection, you need to add buyer information. Click Add Passenger Message and click Next. 7. After filling in all the information, just click Submit Order to buy train tickets online.