Obviously, orphanges would be the prime target of your charity. Also, you might try contacting some of the churches in the city.

I only have personal knowledge of Handicap International here in Beijing. They are a Belgium-based NGO that provides physical rehabilitation support and trains local people to assume those services. While their China headquarters is in Beijing, they have several centers around China. Also, their services are not limited to children, but many of them are (as in the case of the children who survived their schools' destruction in the recent earthquake disaster in Sichuan Province). You can look them up at the website: www.handicapinternational.be. I have done some volunteer work with them, but have no formal connection...just trying to provide some helpful ideas.

we worked with the Ping An Medical Foster Home here in Beijing for our charity parties. It's very local, you can visit the kids, and you know the money's going to the right place.