What type of visa do I need as a participant to the UNDAC Assessment Training Course ?

I am a member of the UN Disaster Assessment and Coordination (UNDAC). There will be an UNDAC Assessment Training Course to be held at the Training Base of the Chinese Earthquake Administration, Fuxing Avenue, Beijing, China on Sept. 2-7, 2012. I am supposed to arrive on Sept 2 and depart on Sept. 7.