Pu Zhiqiang, a celebrated rights campaigner who has represented dissident artist Ai Weiwei, was detained last May in the run-up to the 25th anniversary of the Tiananmen Square killings.
Pu, 50, was accused of "inciting ethnic hatred" and "picking quarrels and provoking trouble", for comments made on the Twitter-like microblogging service Sina Weibo, Beijing prosecutors said online.
The charges, which carry maximum jail sentences of 10 and five years respectively, are said by his legal team to stem from 28 posts he wrote on the service.
Pu is virtually certain to be convicted. The party keeps a close grip on the court system and according to official figures 99.93 percent of defendants in Chinese criminal trials are found guilty.
British-based campaign group Amnesty International called for authorities to "end their persecution" of Pu.
"He did nothing more than comment on current affairs on social media. The Chinese government is blatantly violating his freedom of expression and attempting to silence an independent voice," Amnesty researcher William Nee said in a statement.
Pu was previously celebrated in China's state-run media for seeking compensation for people sent to "re-education through labour" camps. The government said in 2013 it would abolish the system.
Beijing prosecutors said on a verified Sina Weibo account that "Pu Zhiqiang used information networks to send many Weibo posts inciting ethnic hatred".
Pu "insulted others, disrupted public order and shall be held criminally responsible", the statement continued.
Pu, who is diabetic, has been subjected to harsh treatment by the authorities during his year in detention, according to a letter written by his wife in December.
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