I am trying to find China's Agenda 21 policy document. Do you have it on your web site?
If you are referring to China’s Priority Programme for Agenda 21, the summaries are available through http://sedac.ciesin.columbia.edu/china/policy/acca21/21desc.html.
If you are seeking more general information on Agenda 21, I’d suggest that you refer to the UN Agenda Sustainable Development website, https://sustainabledevelopment.un.org/