China is one of the countries participating Hague Adoption Convention, so the US citizen adopting a child from China must follow the Hague Adoption Convention regulations. You also need to know the adoption policy in China because the adoption need to be done in China and in US. By the way, you can find a lawyer from any state in US, not have to be your local area.
Read these links:
http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b9ac89243c6a7543f6d1a/?vgnextoid=a22c741b78c73210VgnVCM100000082ca60aRCRD&vgnextchannel=a22c741b78c73210VgnVCM100000082ca60aRCRD
http://www.hooyou.com/adoption/
Read these links:
http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b9ac89243c6a7543f6d1a/?vgnextoid=a22c741b78c73210VgnVCM100000082ca60aRCRD&vgnextchannel=a22c741b78c73210VgnVCM100000082ca60aRCRD
http://www.hooyou.com/adoption/