Coating technology is currently widely used in machinery, electronics, optics, aerospace, chemical, textile and food industry and other departments. The use of high-tech means not only the deposition of various metals and alloys, but also the deposition of a variety of compounds, not only in the metal matrix deposition, but also in ceramics, diamonds, glass and even plastic and other non-metallic deposition, Coating technology has penetrated into all areas of the national economy, its role and effectiveness for all to see, whether domestic or foreign machine tool exposition, people will see a wide variety of different methods of coating tools, application examples are numerous.