Supercritical fluid technology,a promising green technology,has been used in environmental protection and biology technology recently.This paper summarizes the basic features of supercritical fluid and the measurement methods of critical temperature and critical pressure.The characteristics of supercritical water oxidation(SCWO) and its reaction mechanism are introduced.The applications of SCWO technique in sludge,solid waste and waste water treatments are reviewed.SCWO has proved to be a very promising mat...