Who are held in Jianyang prison?

According to the provisions of the Criminal Law and the Criminal Procedure Law, criminals sentenced to death with a two-year suspension, life imprisonment or fixed-term imprisonment shall execute their sentences in prison.

People's Republic of China (PRC) Prison Law

Article 2 A prison is an organ of the state that executes criminal punishments.

According to the provisions of the Criminal Law and the Criminal Procedure Law, criminals sentenced to death with a two-year suspension, life imprisonment or fixed-term imprisonment shall execute their sentences in prison.