I would like to know how to go to xitang from hangzhou airport. How to go to wuzhen from xitang.

From Hangzhou airport, you can take the bus directly to Jiaxing West Bus Station, then catch a taxi to Xitang. Or take bus fromJiaxing to Jiashan and then catch a taxi to Xitang.
From Xitang to Wuzhen, you can take bus back to Jiaxing and then take bus from Jiaxing to Wuzhen.
There is also direct bus from Wuzhen to Hangzhou. After arriving in Hangzhou, you can catch a taxi to the West Lake.