Abstract: The oxidative desulfurization of model oil and straight-run diesel catalyzed by lanthanum phosphomolybdate under microwave radiation was studied.And the desulfurization rates and recovery rates of diesel with different extraction conditions were investigated.Under the same reaction conditions,the conversion rates of DBT and BT were 7.5 times and 3.9 times higher under microwave radiation heating than that of traditional heating,respectively.Both of the oxidative reactions of DBT and BT were in conformity with apparent-first order kinetics.The conversion rates of DBTand BTcould be up to 94.0% and 91.2% under 400W microwave radiation and 70℃,respectively.The best reaction conditions for oxidative desulfurization of straight diesel are:m(catalyst)/m(diesel) is 7.1mg/g,the initial concentration of H2O2 is 0.44mol/L,microwave power is 400W,reaction temperature is 70℃ and reaction time is 120min.When extracted once with V(DMF)/V(diesel) of 1/4,the desulfurization rate of diesel was 64.5% with the recovery rate of 97.6%.And with higher V(DMF)/V(diesel) or extraction times,the desulfurization rates increased,but the recovery rates of diesel declined obviously.During the oxidative process of diesel,it was first that hydrogen peroxide attacked the active center Mo(Ⅵ) of the catalyst,then thiophenes were oxidized to sulfoxides,and further being oxidized to sulfones.