Abstract: The Al mat rix composite material reinforced by SiC particle of different sizes was prepared by elect romagnetic cent rifugal casting ( EMCC) . The different size particle dist ribution affected by different exciting voltageswas studied. The hardness and abrasion resistance of different size particle reinforced composite were also studied.The result s show that it is much easier for the smaller particles to scatter evenly with the same exciting voltage byelect romagnetic stirring ( EMS) . The same size particles dist ribute more evenly with 100 V exciting voltage thanwith 50 V exciting voltage. The hardness and abrasion resistance of the composite are improved greatly by the moreeven dist ribution of smaller particles.