Abstract: Transition metal oxide catalysts based on VO_x/TiO₂ have been widely used in the field of flue gas treatment. The V=O group in VO_x plays the role of nucleophilic adsorption of PCDD/Fs. Adding the second active component MoO_x to vanadium based oxide can improve the catalytic activity of the catalyst. In this paper, powder VO_x-MoO_x/TiO₂ catalyst was prepared by wet impregnation method for catalytic degradation of chlorine containing pollutants. The synthesis method, catalytic characterization and performance test of VO_x-MoO_x/TiO₂ catalyst were introduced. The mechanism of the effect of reaction temperature on the catalytic efficiency of chlorobenzene and PCDD/Fs was discussed, in order to provide reference for expanding PCDD/Fs catalytic technology. The experimental results show that VO_x-MoO_x/TiO₂ catalyst has many surface catalytic active sites, good dispersion of active components, low initial reduction temperature, more active oxygen content, large specific surface area, light particle agglomeration and excellent catalytic characteristics. Through comparison, the appropriate catalyst component ratio is 5%VO_x-5%MoO_x/TiO₂ (hereinafter uniformly referred to as V5-Mo5-Ti). The low-temperature conversion of V5-Mo5-Ti catalyst to chlorobenzene decreases with the increase of original stable concentration and space velocity ratio. When the initial concentration of chlorobenzene was 150×10^-6 and the volume space velocity was 10000 h^-1, the conversion of V5-Mo5-Ti catalyst to chlorobenzene was 54% at 150 ℃ and close to 100% at 300 ℃. In the low temperature environment of 150 ℃, the catalytic removal efficiency of PCDD/Fs is more than 86% and the catalytic degradation efficiency is more than 74%.