SiC/C/Cu composite materials of different size of SiC particle was prepared by powder metallurgic method.The effects of SiC particle size on microstructure physical properties of composite materials were investigated.Tests were carried on the tribotester to study the effect of SiC particle size on wear rate under different velocity.The research results indicate that the SiC particles with small size are mainly segregated on the C/Cu interface,while the larger size of SiC particles are embedded in the copper matrix of the SiC/C/Cu composites.The hardness,density and conductivity of composites are increased and the porosity is reduced with the increasing of SiC particle size.The increase of particle size causes the decrease of the mass wear rate of composites at a low velocity and first decrease then increase at a fairly high speed.The composites modified by 25 μm SiC particles have the lowest wear rate.