You can take Tourist Special Line from Suzhoubeizhan (Suzhou North Bus Station).
Departure from Suzhoubeizhan:
first train:06:55 last train:17:15 frequency:20min.
Return from Zhouzhuang Bus Station:
first train:06:55 last train:17:15 frequency:20min.
Journey time: 1.5h Fare: CNY15
Or you can take bus from Shanghai to Zhouzhuang without going to Suzhou.

Hi Ms. Carmen,

Thanks. As what you say, to take bus from Shanghai to Zhuozhang, where can i take from?

There are four places for you to choose:
Shanghai Bawanren Stadium (上海八万人体育场)
Shanghai Hongkou Stadium (上海虹口体育场)
Shanghai Long-distance Bus Staion (上海长途汽车站)
Shanghai Qingpu Bus Station (上海青浦汽车站)