A court in the central province of Jiangxi sentenced Liu Ping and Wei Zhongping to six and a half years and Li Sihua to three years, Li's lawyer Zhou Ze told AFP.
The three had taken photos of themselves last year holding banners urging government officials to disclose their assets as a curb against corruption.
Liu and Wei were found guilty of disrupting public order, "using evil religion to sabotage law enforcement" and "picking fights and provoking trouble", while Li was convicted only of the final charge.
Zhou said it was up to the three to choose whether to appeal but added: "Does it matter? The ruling in an appeal is already decided."
Under President Xi Jinping, who ascended to the top of the ruling Communist Party in late 2012, China has cracked down on dissent including prosecuting about a dozen members of the New Citizens Movement.
Members of the loose and relatively moderate group held small periodic protests and focused on issues such as corruption, migrant rights and education.
Party leaders have also vowed to root out rampant official corruption, but fear that organised popular movements could challenge their control.
A founder of the New Citizens Movement, lawyer Xu Zhiyong, was sentenced to four years' jail in April, and several other Beijing-based participants have also received prison terms of several years for disrupting public order.
Authorities have also sought to stifle online social networks -- a useful way to organise activities and share information and ideas -- by threatening to jail those who spread "rumours".
They detained rights lawyers and activists ahead of the sensitive June 4th anniversary of the 1989 crackdown on pro-democracy Tiananmen protests.
Among those, the prominent rights lawyer Pu Zhiqiang -- who had represented one of the Jiangxi activists -- was arrested last week on suspicion on creating disturbances and illegally obtaining personal information.
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