The transition metal ion-doped TiO_2 filmare prepared with Sol-Gel method, and the effects of doping different metal ions on the ability of TiO_(2)in photocatalyzing degradation of phenol are studied. The results show that doping of Fe~(3+)in TiO_2nanoparticles made photocatalytic efficiency increase, the effects of concentration of doped ions on photocatalytic performance are discussed.