If you are highly qualified you can get a job with a company in America that does business in China and get posted there. One example would be a news organization.
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job sites like 51job.com, zhaopin.com, jobsdb.com etc may work for you, you can try to apply to foreign companies in china, it’ll be much easier for you, but first you must be highly qualified and be sure to have the necessary qualification documents
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An American woman in Shanghai writes the highly popular "Shanghai Technical Writer" blog and in August of last year, put together a five-part series on living and working in China. She included some excerpts from Forbes and the New York Times and summarizes as follows:

10 key points from the article:

1. Work in China is challenging and fast-paced, and young executives get far more responsibility than back home.
2. Executives with China experience will be in high demand in the U.S. in coming years.
3. Expect a significantly lower salary in China because competition is stiff. Americans will be competing with top Chinese university graduates as well as returnees who speak both languages well and understand the culture. Having good English skills is no longer enough.
4. It is much more difficult to obtain a work visa in China than before.
5. Many companies no longer fly you out for an interview. If you’re serious about coming to China, buy your own plane ticket.
6. Start looking for that China job in the U.S.. Find people that know people in China and network, network, network!
7. Training is scarce in Chinese companies. Find something that allows you try to a little bit of everything.
8. Better to start a career in the U.S., get training, gain experience, then move to China.
9. It is very important to learn the language and understand the culture.
10. One of the best ways to start a career in China is to start a language program or teach English at a school. Then network, network, network!

She then goes on to give her thoughts and opinions (she has lived in China since 2001). You can read her entire entry here: http://www.shanghaitechwriter.com/2009/08/17/americans-looking-for-work-in-china/
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Is it a Must to work for someone else in China? Starting your small business would be an alternative. think about what you’re good at then start a Foreign Enterprise Limited Company. I had enough from working for others in China and now I clean my own mess. It is difficult at start but hey that’s the beauty of it!
Most companies hiring you won’t bother to pay you the salary you’re expecting… some of them won’t be able to sponsor your visa and some others will simply come up with a reason to fire you. And firing a foreigner in China means canceling their visas…
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Use both your Chinese and English skill and you will achieve sth in China.
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