Oxidative/adsorptive desulfurization of model diesel oil by dielectric barrier discharge (DBD) plasma in the presence of air as oxygen resource was studied.This new system exhibited excellent desulfurization effect at room temperature when FeCl3-SiO2 is used as catalyst and adsorbent.The sulfur content of DBT in model oil can be decreased from 200 ppm to 3 ppm (S-removal rate up to 98.5％) under optimum reaction conditions (air flow rate (υ),90 ml/min; amplitude of applied voltage (U) on DBD,30 KV; input frequency(?),60 kHz; catalyst amount (ω),3 wt %; the reaction time(t),30 minutes).