From Hangzhou airport going to Grand Mercure Zhongya Downtown Hotel, shanghai

No, there is no train from the airport to Shanghai. You can take the airport shuttle bus from airport to the train station, then take high speed train to Shanghai Hongqiao train station. It takes about one hour and costs CNY78/second class and CNY124/first class. Then take subway line 2 from Hongqiao train station to People's Square and take subway line 1 to Shanghai Railway Station, then walk to the hotel.