Abstract: Several kinds of rutile nano-TiO₂ used in automotive paint were analyzed by UV-Vis spectra,SEM,BET and CPS.On the basis of characterizations,rutile nano-TiO₂ PGNR-508 with aluminium paste was used as the raw materials to prepare the optically variable automotive paint,and the weather resistance and optically variable properties of the paint were analyzed.The results show that the nano-TiO₂ PGNR-508 has a cylindrical structure with about 10 nm of diameter and about 50～100 nm of axial direction size.It has a uniform particle size distribution and strong shielding to ultraviolet radiation.The modification of nano-TiO₂ can give the automobile paint an optically variable effect obviously and can improve the weather resistance of the paint significantly.