A composite powder is provided to exhibit a wide range of ultraviolet rays(UV-A and UV-B) blocking capability and show improved feeling of use and stability by supporting a metal oxide such as Ce and Fe in pores of an inorganic complex powder and an organic complex powder, thereby being usefully used for blocking the UV. A composite powder is characterized in that a metal oxide such as CeO2, TiO2, Fe2O3 and ZnO is supported in an inorganic powder or an organic polymer. A cosmetic composition for blocking UV comprises the composite powder as an effective ingredient. To prepare the composite powder, the inorganic powder or the organic polymer is reacted with at least one metal precursor selected from the group consisting of cerium chloride, cerium nitrate, iron chloride, iron nitrate, titanium isopropoxide, titanium butoxide, titanium sulfate, TiCl4, ZnCl4 and zinc acetate through co-precipitation or impregnation. Further, the inorganic powder has 200 to 900 m^2/g of specific surface area, 0.3 to 1.5cc/g of pore volume and 2 to 20nm of pore size.본 발명은 다공성 실리카 및 다공성 알루미나 실리케이트와 같은 무기분체 또는 PMMA와 같은 유기 고분자 등의 기공 내에 세륨 및 철 등의 금속산화물을 담지시킴으로써 넓은 영역의 자외선(UV-A 및 -B) 차단능을 가지고 사용감과 안전성을 향상시킨 복합 분체에 관한 것이다.
