The accuracy of the precision mold is generally 5 micrometers, and the precision of the mould will be higher and higher as time goes by. Now it is 2~3 microns, and soon 1 micron precision will be listed. This requires ultra-precision machining. The mold industry will be increasingly large. This is due to the development of a large number of cavity caused by the increasing of molding parts and high production efficiency. The mold industry multi-function composite mold will further develop. In addition to punching forming parts, the new multi-functional composite mould can also be used to assemble tasks such as overloading, tapping, riveting and locking, etc., and the performance requirements of the steel are also higher and higher.