Octyl 4-methoxycinnamate is one of the most commonly used sunscreens in the world. It is widely used in skin care cosmetics such as sunscreen (cream, milk, liquid), which can effectively absorb ultraviolet rays in the sun, prevent human skin from being red, sunburnt, and tanned. It is also a therapeutic drug for photosensitive dermatitis. As an oil soluble liquid UV-B absorber, it can be used in industry as a anti-aging agent and UV absorber for plastics and inks.