Veteran reporter Gao Yu was imprisoned last year for allegedly leaking a directive by the ruling Communist Party, warning against the "dangers" of multiparty democracy. She spent 18 months in custody before conviction.
The septuagenarian, who suffers from heart problems, had her seven-year sentence reduced to five in November, and was granted parole on medical grounds.
The official Xinhua news agency said at the time the sentence reduction was made because Gao "expressed guilt" during an appeal hearing held in secret.
She said her actions were part of a "Chinese style plea-bargain", and that officials had warned her against discussing her case in public as a condition of her parole.
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Gao said her decision to talk to journalists was prompted by a physical assault on her son by urban management officials in Beijing who tried to demolish a section of her apartment in Beijing.
AFP could not verify the details of the incident. Pictures posted online appeared to show a large number of police surrounding her home.
She previously wrote for Berlin-based Deutsche Welle, and Germany has said it raised her case with Chinese officials.
"Germany gave me a visa and bought me plane tickets, but (officials) told me I am on medical parole and cannot leave the country," she said.
Police in Beijing could not immediately be reached for comment.
A former winner of UNESCO's World Press Freedom Prize, Gao has been a consistent critic of the Communist Party's authoritarian policies.
She was imprisoned following the government crackdown on student protests in Tiananmen Square in 1989, and again for six years in the 1990s also on a charge of "leaking state secrets".