Zhou Yongkang, the former chief of China's domestic security apparatus, has been sentenced to life in prison.
Zhou, 72, was charged in April with bribery, abuse of power and disclosing state secrets.
He was tried in secret in the city of Tianjin and will not appeal against his conviction, according to local media reports.
He is the most senior figure in the history the Communist Party of China to be indicted. He is one of a series of officials targeted in President Xi Jinping's anti-corruption purge.
Zhou retired as the country's most senior domestic security chief in 2012. He had previously been a key official in China's oil and gas industry.