if you buy a seatless ticket, you can go to the dining car, but you need to meet the following conditions:

1. The dining car is a place that provides catering services, and you need to eat or buy meals or drinks.

2. You can sit in the dining car during the dining time (usually from morning to evening), but you need to buy meals or drinks.

3. If you enter the dining car during the non-dining hours, you may be asked to leave.

4. In special periods (such as Spring Festival travel rush), the dining car may sell seat tickets. You can buy seat tickets and enter the dining car to sit.

in short, if you want to sit in the dining car, you need to know the rules and policies of the dining car and buy the corresponding meals or drinks.