Abstract: Research progress was reviewed on the severe plastic deformation (SPD) behaviors of discontinuously reinforced metal matrix composites. Five kinds of SPD processing principle and methods, including equal channel angular pressing (ECAP), high pressure torsion (HRT), multiple forging (MF), accumulative roll bonding (ARB) and cyclic extrusion compression (CEC), were systematically described.The applications of these methods in aluminum matrix, magnesium matrix, copper matrix and titanium matrix composites, etc. were introduced intensively. The special attention was paid to the microstructure evolution and deformation mechanical behavior of metal matrix composites by SPD, and the SPD mechanism and formation mechanism in the preparation of ultrafine-grain composites were also discussed in details. Moreover, the existing problems and developing trend of metal matrix composites in SPD process were stated briefly, and the application of SPD method for preparing discontinuously reinforced metal matrix composites with ultrafine-grain was prospected.