2. In the application of coatings, nano-materials have obtained excellent properties that ordinary materials do not have because of their special properties and surface structure, showing strong vitality. Surface coating technology is the focus of world attention. The surface coating of nano-materials provides a good opportunity to functionalize large materials. Using conventional coating technology and adding nano-materials, nano-composite system can obtain coating function and realize leap-forward modification of traditional functional coatings. According to the structure and application of the coating, it can be divided into functional coatings. The coating matrix is modified to improve some properties of the coating; In view of the functional properties of non-traditional coatings, functional coating substrates are not available. A superhard coatings, wear-resistant coatings, anti-oxidation, heat-resistance, flame-retardant coatings, corrosion resistance and decorative coatings; Functional coatings include optical coatings that absorb light, reflect light and selectively absorb light, electrical characteristics of electrical, insulating and semiconductor coatings, and oxygen-sensitive, humidity-sensitive and gas-sensitive coatings. With the addition of nano-materials in coatings, the defense ability is further enhanced, and the anti-ultraviolet radiation, atmospheric degradation and discoloration resistance are realized, which can play a certain role in the application of sanitary disinfection and cleaning products. Nano-coating is used on board, and its optical characteristics can be used to store solar energy and save energy. Incorporating nano-materials into building materials such as glass and coatings can reduce the light transmission and heat transfer effect, and play a role in heat preservation and fire prevention. Panasonic Corporation of Japan has developed a good electrostatic shielding nano-composite coating, which is applied to iron oxide nanoparticles, such as titanium dioxide and zinc oxide. These characteristics make nano-semiconductor oxide particles have the high conductivity of conventional oxide films at room temperature, thus playing the role of electrostatic shielding, while oxide nanoparticles with different colors can also control the color of electrostatic shielding coatings, and silicon dioxide overcomes the monotony of electrostatic shielding coatings with only one color. Nano-materials not only change with the size and color, but also with the color effect of the angle. In the decorative spraying of automobile industry, in addition to nano titanium dioxide automobile, automobile metal topcoat will have rich and mysterious color coating effect, which makes the traditional automobile topcoat take shape. Ultraviolet radiation is a kind of nano-silica material. In addition, the aging performance, smoothness and strength of nano-silica coating have increased many times. Nano-coating is an application stage, and coating technology will bring a new technological revolution, which will promote the research, development and application of composite materials.