Oxidative decomposition of aromatic volatile organic compounds(VOCs), toluene and chlorobenzene, were tested in flow reactor under the irradiation of electron beam. The maximum flow rate and concentration were 20 l/min and 1000 ppm on a basis of volume, respectively. The radiation was carried out under atmospheric pressure and room temperature. Main carrier gas was air, and to improve the removal efficiency of VOC, hydrogen peroxide was added into the mixture of air and VOC. In this work, the removal efficiencies were 87.6% and 67.4% at 120 kGy for 100 ppm of toluene and chlorobenzene, respectively. As increasing initial concentration of VOC, higher dosage was required for removal of the VOCs. When pure oxygen being used instead of air, the removal efficiency could be increased additionally by about 40% for high concentrations of VOC. Addition of 28% aqueous hydrogen peroxide could improve the removal efficiency for VOCs. A large amount of aerosol, which molecular weight may be much higher molecular weight than VOCs, was produced in a course of oxidative decomposition of VOCs.