Replying to [zongren]:I suggest taking a train!Just get a map of Shanghai and look at the locations of Train stations. Find one in Pudong where airport is and then go to station and ask for ticket to Yiwu.
<p style="font-family:garamond;font-size:130%;padding:30px;"><img src="http://www.alistapart.com/pix/quote_wh.gif" />As far as I know, there is a train which leaves Shanghai 2pm, and it stops by Yiwu in about three hours, the stop after Hangzhou. </p>