Hello,Ms.Tai
If you are going from Xiaoshan Airport to Shanghai by taxi just by yourself, it will be very pricy. The taxi fare may be up to 500 to 600RMB. Or you can take long-distance bus or bullet train, but they all run early in the next morning, like 01:30 or so. So i suggest you rest in Hangzhou for the first night and go to Shanghai the next day.