All kinds of intelligent precision parts processing emerge, and the market competitiveness is enhanced. It is worth noting that the surface polishing of the mold is not only affected by the polishing equipment and process technology, but also by the mirror surface of the mold material, which has not been paid enough attention. That is, polishing itself is constrained by the mold material. Although new processing technologies aimed at improving the surface properties of precision mold parts are constantly emerging, nitriding, carburizing and hard film deposition are the most widely used in the manufacture of high-precision mold parts. Because nitriding technology can form a surface with excellent performance, and the nitriding process has good coordination with the quenching process of high-precision mold parts steel, and at the same time, the nitriding temperature is low, and no intense cooling is required after nitriding. It is extremely small, so the surface strengthening of high-precision mold parts is the earliest and most widely used nitriding technology.