I live in China and there are many travel agents here, among which the most well-known one is China International Travel Service. It has branches across the nation, and here is a website just for your reference during your China travel.http://www.chinahighlights.com/beijing/

Geri, two sources we generally trust when it comes to travel-agent recommendations are Conde Nast Traveler and Travel + Leisure, both of which put together some detailed and well-vetted sections on the best agents for various interests and regions. Here are a couple of links for you:
http://www.cntraveler.com/travel-tips/travel-specialists
http://www.travelandleisure.com/articles/a-list-worlds-top-travel-agents