Co-Cr alloy is current major material for dental operating repairs.This product containing the elements of cobalt,chromium,nickel,molybdenum,etc,melted in high vocuum,is alloy prossessing the properties of high strength and resistance to corrosion.In the process of dental clinical use,will be wantonod profusion much paarts materials.This project though the meduim of material analyzing and testing.Results to:Co-Cr alloy may reprocess,to waster matter regeneration,in order to reduce medical cost.