Abstract: Disclosed is a UV-screening and color-changing composition and its preparing method, the composition comprising spiro oxazine and spiro pyran as an optical color-changing pigment combined with an animal fat or vegetable oil, and additionally an antioxidant and a stabilizer, which composition has a higher sun protection factor (SPF) and can be used as a cosmetic or skin-protecting photo-sensitive material to increase the color-developing concentration when exposed to solar or UV radiation and to provide a cream or oil formation ready to color development or decolorization. The composition has a higher SPF number compared with the conventional skin protecting compositions and, particularly has an ability of changing in color and screening UV radiation without any irritation on the skin.