Speaking in Washington, Yu Jie said he was harassed by police, then abducted and severely beaten.
Mr Yu, 38, wrote “China’s Best Actor: Wen Jiabao”, a controversial book that scrutinised the premier. The book was banned in mainland China.
Meanwhile a court in China has jailed a democracy activist for subversion.
It is the third lengthy jail term handed down to a government critic in China in less than a month.
‘Traitor to the state’
Mr Yu arrived in the US on 11 January to live with his wife and son.
On Wednesday he appeared at a press conference and also released a statement – published on the rights group Human Rights in China website – describing persecution at the hands of state police.
He said that after Liu Xiaobo was awarded the Nobel Peace Prize “illegal house arrests, torture, surveillance and tracking, and being taken on ‘trips’ became part of my daily life”.
Mr Liu is currently serving an 11-year jail term in China for inciting subversion.
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