^{An introduction to the methods of improving the performance of Mould.}

^{The matrix is required to have high enough strength and toughness to fit the mold during work,and surface property play a important role in work performance and  service life of mould.surface properties includes abrasion resistance、corrosion resistance、fatigue property and friction coefficient.To improve this property,it is super limited and uneconomical to rely on the improvement of matrix materials solely,but we can get twice the result with half the effort by surface treatment technology,so this is why surface treatment technology is developing rapidly.}

^{The surface treatment technology of mould is a system engineering for obtain the required surface properties by surface coating, surface modification or composite treatment to change the shape, chemical composition, structure and stress state of mould surface.}

^{CVD PVD is the mature deposition technology of hardening film at present.In order to increase the bonding strength of the work piece surface, a variety of enhanced CVD PVD techniques have been developed.Hardened film deposition technology was initially applied to props(knives, cutting tools, measuring tools) with excellent effect,a variety of tools has been coated hardened film as standard process.The technology of coating hardening film has been used in mould since 1980s.Under the present technical conditions, the cost of hardening film deposition (mainly equipment) is high,because this technology is only used in some precision and long-life mould,if we want to reduce the cost of coating hardening film,the measure of heat treatment center should be established.If more molds adopt this technology, we can improve the level of mould manufacturing in our country as a whole more fast.}