Ionic liquids are important compounds with special properties and the task-specific ionic liquids are the hotspot at present. This paper is focusing on the functionalization of ionic liquids，which is combined with the structure of benzenesulfonic acid. Two kinds of novel water and air stable ionic liquids are designed and synthesized .One bears an alkoxy benzene group and an alkyl benzene group in a N-methylimidazolium cation respectively，and the other bears an alkoxy benzene sulfonic acid group and an alkyl benzene sulfonic acid group in a N-methylimidazolium cation respectively.Both of the counter anions are HSO4-. All the compounds are new，and their structures are confirmed by IR spectrum and 1HNMR. Acetonitrile has been used as a probe molecule to determine the acidity of ionic liquids, and the results indicated that they were brønsted-acidic ionic liquids. All of the synthesized ionic liquids are miscible with strong polar solvent, and they are insoluble with weak polar and nonpolar solvent. They show good effect on the synthesis of ethyl palmitate and ethyl benzoate, and the produced esters could be separated by decantation; the ionic liquids could be reused after the removal of water.