Abstract: In order to remove low concentration gaseous benzene in closed ambient,TiO₂/ACF composite was prepared by sol-gel and dipping-coating method with Ti(OC₄H₉)4 as precursor.Orthogonal experiment was conducted to investigate the effect of deionized water,C₂H₅OH,CH₃COOH and calcination temperature of TiO₂/ACF four factors on the photocatalytic activity of TiO₂/ACF.The decomposition performance of TiO₂/ACF prepared was investigated for low concentration gaseous benzene in dynamic system.TiO₂ was also characterized by X-ray diffraction(XRD).The results showed that the optimal technology were determined as the Ti(OC₄H₉)₄ is 7.5ml,the C₂H₅OH is 22.5ml,the CH₃COOH is 10ml,the deionized water is 3.5ml and the calcinations temperature of TiO₂/ACF is 400℃,the content of anatase in sample is 100%,the average crystallite sizes is 13.5nm and the dynamic average degradation ratio of low concentration gaseous benzene reaches up to 50% in 3 hours period.