i want trip from Beijing, Xian, Shanghai, xitang city in hangzhou

I am wondering if you are referring to the itinerary or transportation. Anyway, the best route can be Beijing - Xian - Shanghai - Xitang - Shanghai - leaving

Generally, ten days can be enough to cover the major sites in these cities. And the recommended transportation is as follows:
Beijing - Xian: high speed train or airplane; to Shanghai: by air; to Xitang and back to Shanghai: long-distance bus or train.
Hope help!