With the widespread use of automobiles, automobile perfumes have also come into our lives. The quality of car perfume directly affects the mood and safety of drivers. Car perfume can keep the air in the car clean, remove odors in the car, kill bacteria, and play a role in purifying the air. Car perfume is conducive to driver's driving safety. It can create a refreshing and pleasant atmosphere in the narrow space of the car to keep the driver's mind clear and calm, which can reduce the incidence of traffic accidents and increase the taste of the car .Car perfume, in addition to the scent, is still a good small decoration in the car, active atmosphere, improve driving pleasure. Car perfume contains a certain amount of hydroxytyrosol. During the volatilization process, hydroxytyrosol will stimulate the brain and olfactory nerves, enter the thalamus, and then affect our cortical area. This is why people feel comfortable and refreshing when they smell perfume in a car.