Is there a bus from zhengzhou airport going to xinyang?

No direct bus is available. You can go to local General Bus Station, where buses to Xinyang are available at 07:50, 08:00, 09:10, 11:30 and 13:30. It costs CNY85/90 per person and takes 4h.

Or take a high speed train at Main Railway Station or East Railway Station to get there within 1.5-2h.

hi, thanks ,but how can.i get to the east station from the airport.my arrival time is 18:35 from guangzhou, i will take the last train from zz dong to xinyang dong which is 21:00 / 9:00p.m.do i have enough time

Light Rail / High speed train is available between Xinzheng Airport and the East Railway Station. As for your case, you can take the one at 19:24 and it only takes 20min. Then you can surely catch the train at 21:00.