Nuclear facility decommissioning is a comprehensive project, including source investigation, decontamination, demolition, waste management, radiation detection, radiation protection, site decontamination, etc. Decontamination is an important activity for decommissioning of Nuclear facilities. After decades of research and development, nuclear facilities decontamination technology is divided into chemical decontamination, mechanical decontamination, electrochemical decontamination and biological decontamination. This paper reviews the methods and research situation of chemical decontamination technology in decommissioning of nuclear facilities.