Abstract: SiC_p double scale reinforced Al matrix composites were prepared by powder metallurgy method.The size ratio of 50 μm∶10 μm SiC_p is 1∶1, 2∶1, 3∶1, 4∶1 and 5∶1, respectively, and the total added content is 20vol%.The wear resistance of the composites and the comparison specimen HT300 material were tested by a pin-disk friction and wear tester, and the microscopic morphology of the composites and HT300 before and after friction and wear were characterized using SEM and EDS, and the friction and wear mechanism of the composites was analyzed. The results show that SiC_p binds well with Al matrix interface, no interface deadhesion and pores form. The SiC_p/Al matrix composites with either SiC_p particle size ratio have better wear resistance than HT300, and the best wear resistance is achieved with a particle size ratio of 3∶1, and the wear amount of HT300 is about 7-13 times of that of the material with the particle size ratio of 3∶1.