Our company adopts a cylinder-bore which is composite plated for weight saving and high output characteristics of the motorcycle engines. The composite-plated-cylinder has good wear resistance in an efficient performance while there are some problems to control the composite plating solution since this solution contains particles which make filtration and electrolysis difficult. Therefore we need to renew the solution within the stated periods, which brings about high cost and environment impact. Thus we developed a recycle and reuse system by the used composite-plating-solution. This method will cut costs by 50% approximately and reduce environment impact by reducing waste of plating solution.