Cai Lujun was born in Feixiang County, Hebei Province.

He was an owner of a foreign trading company and a freelance writer.

[1] Cai was one of the first persons in China to be arrested for posting articles on the internet.

He was accused of posting a series of articles online under the pen name "盼民主 (Pan Minzhu)"("expecting for democracy") criticizing the Chinese government.

He was found guilty of “incitement to subversion” and sentenced to three years in prison by Shijiazhuang Intermediate People's Court on 30 October 2003.