Abstract: TiO2 catalysts on glass fibres were prepared by the sol-gel method, and then 0.2% Fe3+ and Ce3+ were doped to modify the TiO2 photocatalysts.Experiments of the batch photocatalytic degradation of benzene were carried out, and the results indicated that Fe3+ and Ce3+ doping could improve the photocatalytic activity of the TiO2 catalysts, of which the 0.2% Fe3+/TiO2 photocatalyst was the best.XRD, SEM and XPS were used to analyze physical and chemical variation of TiO2 catalyst surfaces after Fe3+ and Ce3+ doping.The results showed that 40—60 nm size TiO2 anatase particles were deposited on glass fibre, the concentration of Ti3+was increased and the concentration of hydroxyl was decreased on the surface of photocatalysts which were doped 0.2% Fe3+ and Ce3+.Ti3+ could adsorb oxygen and react with oxygen to produce Ti4+ and O-2 simultaneously on the surface of photocatalysts.Oxidant O-2 plays an important role in the photocatalytic degradation process of benzene.