The application of BrØnsted acidic ionic liquids of ［BMIM］HSO ₄ and H ₂SO ₄ as catalyst in alkylating desulfurization technology of gasoline was studied. The result shows that the mixture of ［BMIM］ HSO ₄ and H ₂SO ₄ has better selectivity than sulfuric acid on catalyzing the alkylation of thiophene and alkene, under the same reaction condition. The conversion rate of thiophene increases as reaction temperature increases, but when the temperature is higher than 45 ℃, hexene decreases sharply due to polymerization. The conversion rate of thiophene increases with the increasing of reaction time, it costs about 2h to meet the equilibrium of reaction between thiophene and hexane.