Prospective WWOOFers ask for information about Visa’s and traveling in China. WWOOF China is giving this link which hopefully will answer all the questions about Visas for traveling to China.
NOTE: There is a newer version of this post here.
http://www.china-embassy.org/eng/hzqz/zgqz/t84246.htm
Things to remember
WWOOF is a cultural exchange experience for tourists in China.
Chinese citizens and residents may also becoome WWOOFers.
You must be 18 years of age to WWOOF without a legal guardian.
Hosts will ask to see your identification and WWOOFer Registration when you arrive.
Each adult must have individual registration and show their ID.
Happy WWOOFing!