Several SO3H-functionalized acidic ionic liquids were synthesized by two-step method, using 1, 3-propane sultone and 1, 4-Butanesultone as raw materials, respectively. Esterification of 1-butanol with adipic acid was carried out by using these different Br謓sted acidic ionic liquids as catalysts without removal of water. The relationship between the Br謓sted acidity-catalytic activity and the relative acidity were studied. Moreover, the reaction conditions of reaction temperature, molar ratio of reactants, reaction time and ionic liquid amount were optimized. The results indicated that, [MimN(CH2)4SO3H][HSO4] acidic ionic liquid was the best catalyst, and under the optimized reaction conditions of 110 ℃, n(1-butanol): n(adipic acid)=6:1, m(cat): m(adipic acid)=1.5 %, 3 h, the yield of dibutyl adipate was 90 %.