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Skin photoaging is proved to be closely associated with ultraviolet exposure. Ultraviolet protection may be realized by wearing protective clothings, environmental photoprotection, sunscreen application. The use of sunscreens is aimed to minimize the damage of ultraviolet to skin, so as to slow down the process of skin photoaging. Based on the mechanism of action, sunscreens could be classified into physical sunscreens, chemical sunscreens and vegetal sunscreens. Sunscreens have been widely applied in the treatment and prevention of skin photodamage, and with the development of science and process technology, their safety is also gradually improved.