Abstract: It is estimated that currently about 15 million tons of waste rubbers are produced annually.Because of having steady three-dimensional chemical network,degradation of them needs long time and piling up them in the nature without being disposed,brings serious environmental pollution and wastage of valuable rubber.Reclaiming rubber from waste rubber is the best approach to solving this problem.In companions with several other methods,the ultrasonic devulcanization having advantages of high efficiency,no pollution and good quality is regarded as the most promising method.In this paper the applications of power ultrasonic to devulcanization of waste rubber was introduced in detail.