The standing committee of the National People's Congress (NPC) said people convicted on serious corruption charges and who were handed death sentences suspended for two years will have those converted to life in prison after the two-year period, the official Xinhua news agency reported.
The change is to "safeguard judicial fairness" and prevent "the most corrupt criminals from serving shorter prison terms through commutation", Xinhua quoted NPC as saying.
Ruan Qilin, a professor at the China University of Political Science and Law, said that the change to corruption sentencing was aimed at officials who use illegal means to have their sentences commuted or to achieve parole or non-prison sentences, the report said.
Critics, however, say there are no safeguards against the campaign being used for political purposes and that no systemic reforms have been introduced to fight graft.
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China also repealed the crime of sex with prostitutes who are underage and instead made it rape, a crime subject to harsher punishment, the Xinhua report said.
Previously under the law, people who had sex with prostitutes aged below 14 years old faced a maximum of 15 years in prison, the agency said in an earlier report.
Prostitution is illegal in China but an estimated several million sex workers operate from establishments including karaoke bars, hair salons, saunas and massage parlours.
China's public security ministry ordered a nationwide crackdown on the sex trade last year following an expose of a city known for prostitution amid criticism that authorities long turned a blind eye.