How can I go to Chongqing from Hangzhou? I arrive at xiaoshan airport 11.00 PM.

Oh, it's too late. You cannot get to Chongqing in the same day. Then I would recommend you take a taxi to go to local east railway station (the cab fare is CNY100-120). Check in a hotel nearby and stay there overnight. Nest morning, take the bullet train, No D2222 (departure at 07:35am) to Chongqing.

If possible, book the train ticket in advance in case that all tickets are sold out.

Thanks a lot Apple