The photocatalytic decomposition characteristics of toluene by a cylindrical UV reactor with helically installed TiO2-coated perforated planes were investigated. The reactor was also equipped with UV254+185nm lamps in its front half and UV254nm lamps in its rear half. The inserted TiO2-coated perforated planes increased the TiO2 coated area by about 2.2 times compared to that of simple TiO2-coated cylindrical reactor walls. Meanwhile, UV254nm lamps reduced more than 95% of the residual ozone produced by UV254+185nm lamps. Under the linear velocity ranging from 1.3 m/min to 2.6 m/min, the removal of toluene was up to 95% at an inlet toluene concentration of 94.3 mg/m(3). Based on the inlet toluene load of 968 g/m(3) per day, the maximum capacity of toluene elimination was obtained to be 628 g/m(3) per day. The effcient decomposition of toluene in our custom-designed UV reactor was attributed to the synergistic effect of photo-chemical oxidation by ozone and photocatalytic oxidation by TiO2 photocatalysts.