Due to the growing awareness of UV protection in recent years, many people have come to use sunscreens in various scenes. However, in Ieisure and sports scenes, sweat and water may wash them off and the expected UV protection effect may not be obtained. Therefore, in the development of sunscreen formulations, it is important not only to enhance the UV blocking effect, but also to have water resistance technol. to maintain the effect. In this review, we will introduce the basic knowIedge of UV protection materials and formulation development technol. used in sunscreens, and the development of materials that achieve both high SPF/PA and water resistance.