Copper coated SiC particles were prepared by the electroless plating method. The influence of pretreatment, the plating solution component, the pH value and loadage on the Cu layer were analyzed. Furthermore, the effects of adjusting the content of sulfate and the loadage on controlling the copper content in the composite powder were compared .The phase, morphology and component of powder were analyzed with XRD,SEM and EDS to obtain the optimum plating process. The results show that the uniform Cu coat can be obtained only when the activating solution for pretreatment deposited for some time; Along with the pH value and the sulfate content increases, the speed of plating increases, but the cladding perfection and uniformity of powder reduces; Adjusting the loadage is a better way to control the content of copper in composite powder.