Abstract: This paper briefly introduces a new branch of chemistry,sonochemistry which was formed in the mideighties.Based on the point of view of interaction of energy and matter a comparation of sonochemistry with other chemical branches is presented and a wide prospect of development of sonochemistry is pointed out as well.Furthermore the sound cavitation has been discussed with emphasis on the idea that sound cavitation is main motivation in the sonochemical reaction. Finally the research advance of principle and technology detecting sound cavitation is described.