When the human skin is stimulated by ultraviolet light, the oxidase (tyrosinase) in the pigment cells at the base layer of the epidermis is active, and tyrosine, one of the amino acids, is oxidized and polymerized to produce melanin, which is sent to the epidermis to make the skin black. However, silicone sunscreen has no stimulation to the skin, and is not prone to chemical changes in the face of heat and light, and is easily adsorbed on the skin. It can prevent pigmentation caused by sun exposure, play a role in preventing suntanning, and its effect is better than ordinary sunscreen. If the sunscreen containing silicone oil will not be washed away by sea bathing and sweating, it can prevent the harm of ultraviolet rays. It is best to add methyl phenyl silicone oil to the sunscreen, phenyl has a certain ability to absorb ultraviolet light, its sunscreen performance is better than methyl silicone oil. Linear alkyl silicone oils are also valuable ingredients in the manufacture of sunscreens, improving their lubrication and hydrophobicity.