Abstract: TiO₂ photocatalyst was prepared using sol-gel method,photocatalytic reduction Cu²⁺ reaction was carried out under ultralviolet.The results demonstrated that the best addition of TiO₂ was 50mg in the experimental conditions;photocatalytic reduction efficiency of Cu²⁺ was best when pH=6.0;the photocatalytic reduction efficiencies were increased with the increasing Cu²⁺ concentrations when the Cu²⁺ concentrations were low,the photocatalytic reduction efficiencies were reduced with the increasing Cu²⁺ concentrations when the Cu²⁺ concentrations were high;the best hole scanvenger was D(+)Xylose,the addition quantity of D(+)Xylose was controlled within 10% when the Cu²⁺ concentration was low;the best hole scanvenger was phenol,the addition quantity of phenol was controlled within 10% when the Cu²⁺ concentration was high.