How can I book a bus ticket from zhengzhou to beijing, round trip? Thank you

You can book the tickets through your hotel, or you can go to the bus station to book the tickets in advance. But I heard only single trip bus tickets reservation is available. Three long-distance buses are scheduled to Beijing at the local Central Bus Station near the main railway station at 09:30, 11:40 and 18:40. It takes 9h.

While as the bus schedule is very limited and the travel time is long, you are suggested to take the bullet train to shuttle between these two cities. The travel time is about 3 hours. There are many trains available (from local East Railway Station).