Using AlPO 4 as binding agent, TiO2/ACF filters were prepared by adhesive method. The properties of TiO2/ACF were investigated by means of XRD and BET. Closed-cycle experiment system was set up. Gaseous xylene was selected as the model pollutant and adsorption-photocatalytic degradation was proceeded in the system. Influences of initial concentration, face velocity and relative humidity on the degradation results were studied. The results show that nano-TiO2 particles were well loaded on the surface of ACF, the specific surface area of TiO2/ACF was 672.8 m^2/g. When C 0 ranged from 28 to 42 mg/m^3, the change of initial concentration had little impact on the degradation process. With the increase of face velocity, both the adsorption rate and photocatalytic degradation rate of gaseous xylene were first increased and then decreased, which reached the maximum value at v =0.3 m/s. With the increase of relative humidity, the adsorption rate of gaseous xylene decreased gradually, whereas photocatalytic degradation rate first rose and then fell. The adsorption-photocatalytic degradation rate of gaseous xylene by using TiO2/ACF reached the maximum value at RH=50%.