Abstract: Reaction feed was prepared as follows: thiophene selected as model organosulfur compound in gasoline was dissolved in n-octane. The adsorption of thiophene in n-octane by activated carbon was investigated. The oxidant was 30% aqueous solution of hydrogen peroxide. Oxidative desulfurization with 30 % H2O2 in the presence of the activated carbon and formic acid was studied. Catalytic performance of the activated carbon and the effect of reaction conditions on oxidative removal of thiophene were investigated. Experimental results indicated that performic acid and hydroxyl radical produced in situ are coupled to oxidize model organosulfur compound with desulfurization ratio of over 85%. Catalytic performance of the combination of activated carbon and formic acid is higher than that of only formic acid. Formic acid concentration, activated carbon dosage and initial hydrogen peroxide concentration, reaction temperature affect the oxidative removal of thiophene.