Reflective film is a retro-reflective material that has been made into a thin film and can be used directly. It is made by glass bead technology, micro prism technology, synthetic resin technology, thin film technology and coating technology and micro replication technology. Usually there are white, yellow, white, green, blue, brown, orange, fluorescent yellow, fluorescent orange, fluorescent yellow-green, and fluorescent white and fluorescent pink abroad. All kinds of reflective signs and signs, vehicle number plates, safety equipment, etc., which are mainly used for manufacturing, play a distinct warning role in the daytime with their bright colors. At night or in the absence of light, the bright reflective effect can be invalid To strengthen people’s recognition ability, see the purpose clearly, and arouse vigilance, so as to prevent accidents, increase casualties, reduce economic losses, and become an indispensable security guard for road traffic. It has clear social benefits.