Metal plating is a process of plating sediment by electrolysis to change the characteristic of the part and improve the corrosion resistance, abrasion resistance and other function of the appearance and medium. Plastic plating is by metal treatment to nonmetal surface, and then by a process of plating sediment by electrolysis to change the characteristic of the part and improve the corrosion resistance, abrasion resistance and other functions of the appearance and medium.