Ozone generater products ozone gas that has strong oxidation function and catalysis. Virus and bacteria was affect by all kinds of free radical in the ozone gas ,which make protein dissociation and denaturalization. The activity of nucleic acid and enzyme is reduced ,thereby it can disinfect and sterilize. Ozone sterilizes broad-spectrum which can kill all kinds of virus and bacteria Ozone has physical and chemical reaction of degradation and oxidation with formaldehyde, carbon dioxide ,dimethylbenzene and others toxic gas and harmful gas;and innocuity ,no poison and no secondary pollution It is the more cuspidate and high and new technology in the wholeworld to use ozone gas to sterilize ,disinfect ,eliminate bad odor ,purify air .The experts at home and abroad call it one of four skills in 21C.