Liu Yuandong, a member of the Southern Street Movement, a loose network of laymen-activists campaigning on a broad civil rights agenda, faced a charge of "disturbing public order" after taking part in anti-censorship protests last year, his lawyer Liu Zhengqing said.
Liu is the latest of several Chinese activists to face trial this week, in what has been seen as a coordinated attempt by the ruling Communist Party to quash challenges to its rule.
In the most prominent of the current cases, the founder of the separate New Citizens Movement Xu Zhiyong was tried in Beijing on Wednesday, and his lawyer said the verdict against him would be announced Sunday.
US ambassador to China Gary Locke has called for Xu and other "political prisoners" to be released, and his arrest was condemned by the EU.
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China has dismissed such criticism as "interference" in its internal affairs.
Liu and the other defendants are almost certain to be found guilty by China's politically controlled courts.