Abstract: In order to improve the photocatalytic performance of TiO₂,Nitrogen and Prasedymium co-doped titania photocatalysts were prepared by the sol-gel method. The samples were characterized by XRD,SEM and UV-Vis spectrophotometer. The effects of the doping amount,the calcination temperature and the crystal form on the photocatalytic performance of TiO₂ were investigated. The results show that N-Pr-TiO₂ show higher photocatalytic activity than undoped TiO₂. When N and Pr in the sample are 5% and 0.5%(molar ratio) respectively and the anneale temperature is 500 ℃,the modified TiO₂ is anatase phase and the particle size distribution is narrow. Under the simulated light,the N(5%) Pr(0.5%) TiO₂ shows high photocatolytic activity and high capacity in degrading methyl orange solution,whose degradation rate is up to 99% within 80 min.