Abstract: Fe³⁺/SO₄^2-/TiO₂ photocatalyst was prepared by sol-gel method with the ultraviolet light as light source.The various experimental conditions for photocatalytic oxidation of phenol were studied.The results were as follows: the optimum mass of catalyst was 2～3 g/L;when pH=6.7～9.0,the phenol removal efficiency was very high;the COD_cr removal efficiency decreased with the increase of initial concentration;when the mass concentration of H₂O₂ was 90 mg/L,photocatalytic effect was optimum;the COD_cr removal efficiency was best at the concentration of Cr⁶⁺=8 μg/mL,the reduction efficiency of Cr⁶⁺ was 90%;Hg²⁺ had no great influence on the COD_cr removal efficiency;the reduction efficiency of Hg²⁺ was 99.5%.