If convicted by the court in the eastern city of Hangzhou, Lu Gengsong and Chen Shuqing could face up to life in prison.
Lu's wife, Wang Xue'e, and Chen's wife, Zhang Donghong, said the men pleaded not guilty to the charge when standing trial in Hangzhou Intermediate People's Court today.
They said the men, who were tried separately, argued that they were exercising their rights to speech and organization as granted by Chinese law.
China has a one-party rule under the Communist Party.
