please guide me how to go Shanghai pudong airport to yiwu at 11.00 pm(night time)

Well, according to your arrival time, there is no long-distance bus at the airport. The schedules are 8:50am, 11:30am, 14:10pm and 17:10pm. And there is no train that can take you to Yiwu at that time. The last train is at 23:35 pm.
So you are suggested to stay at the hotel near the airport. Then take long-distance bus at the airport next early morning.