Which Long Distance Bus station has bus from Hangzhou down town to Suzhou?

You may take a coach to Suzhou from Bus Passenger Transport Center at no. 3339, Shengdong Road, Jiubao Town, Jianggan District. It is near Exit A, Passenger Transport Center Station, Metro line 1. You can easily find it. The coaches are available from 8:20 to 18:45 an an interval of 30-40 minutes, and the fare is CNY 71 per person. :)