There are no requirements for .cn domains- any organization or  person in the world can register a .CN domain. CN domains can only be  registered/renewed up to a maximum of 5 years.

Please note that  .CN domains are deleted three days after their expiry date. Domains can  be renewed up until they are deleted. Once deleted, they are available  for registration in 15 days. There is no redemption grace period for .CN  domains.