Present status of studies on High Strain Rate Superplasticity (HSRS) of Metal Matrix Composites (MMCs) is introduced,including tensile and compression superplastic deformation.The fabrications of different composites,the conditions for obtaining HSRS and the characteristics of superplastic deformation are smnmarized.The deformation mechanisms of MMCs,especially that reinforced by particles,are discussed in detail.Problems of current research and some suggestions are also presented in this paper.