Nanomaterial coatings have widely varying optical properties. Its optical transmission spectrum can extend from the ultraviolet band to the far infrared band. After being processed, the nano multilayer composite coating will fluoresce in the visible light range and is used for a variety of optical applications, such as sensors and other devices. Applying nanomaterial coatings on the surface of various signs can make them luminous and reflective signs; changing the composition and characteristics of the nano coating can obtain photochromic, thermochromic, electrochromic and other effects, and produce special anti-counterfeiting and identification methods. 80nm yttrium oxide can be used as an infrared shielding coating with high efficiency in reflecting heat. Applying nanomaterial coatings on the surface of products such as glass can reduce the transmission of light and heat transfer, and produce heat insulation; adding nanomaterials to the coating can play a flame retardant, heat insulation and fire prevention role.