Magnesium alloy matrix composites（MMCs） were fabricated by squeezing-infiltration casting with the perform made of crystallined aluminum silicate short fibers as reinforcement and aluminum phosphate as binder at high temperatures.Drying sliding friction and wear resistance of the MMCs were examined by means of MM200 wear tester（block-on-ring configuration） against a hardened alloy steel counterface with 53HRC under loads of 10,30 and 50N at 0.47 m/s and 0.92 m/s,and the wear morphology of the tested specimens was observed by SEM（scanning electronic microscope）.The results indicate that wear mechanism of the MMCs is characterized by abrasive wear with loading 10 N and 30 N at 0.47m/s,while it is characterized by abrasive wear with slight flaking wear with loading 50 N at 0.47m/s,and it exhibits combined wear of abrasive wear with slight adhesive wear with loading 50 N at 0.94 m/s,increasing the wear resistance of the MMCs.