Application of supercritical fluids (esp. supercritical water) in environment protection and waste treatment is discussed. The character of supercritical fluids is analyzed. The technology of degradation of waste plastic using supercritical fluids all over the world is introduced,and the application of supercritical water oxidation in waste water treatment and sludge treatment is described too. It is concluded that SCF technology is the tendency of environment benign chemistry. We suggest that our countr...