Abstract: TEM, GPC, IR, and mechanical property tests were carried out to study the effect of inorganic nanomaterials such as TiO2, SiO2, ZnO on the UV aging resistance of PP. It was found that the best dispersion was achieved when the loading of inorganic particles was 0.3 wt%, at which the mechanical properties of PP was obviously enhanced and the anti-UV aging behavior of PP/nano-TiO2 was the best. Compared with neat PP, the elongation at break of the composite after 144 h of aging under 340 nm and 313 nm of UV light was increased by 31.5 % and 11.8 %, respectively

Key words: polypropylene, Inorganic nanomaterial, ultraviolet aging, elongation at break