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Suitable control of the humidity can contribute to electric energy savings.However,the present dehumidification system has many weak points.The liquid desiccant air-conditioning system has recently gained growing interest from the stand point of reducing energy consumption during dehumidification.In order to find the appropriate ionic liquids (ILs) as a desiccant for the liquid desiccant air-conditioner system,we conducted a systematic evaluation of the humidification capability of 16 types of ILs.Among the tested ILs,tributyl(methyl)phosphonium dimethyl phosphate ([P4441][DMPO4]) exhibited the best dehumidification capacity and had a less corrosive effect on four types of metals as possible piping materials.It should be noted that this [P4441][DMPO4] has a very stable nature and produced no odor while conducting the experiment and storing for over i year at room temperature under ambient conditions.Furthermore,it was revealed that a 77％ (w/w) aqueous solution of [P4441][DMPO4] worked as an efficient desiccant liquid for the liquid desiccant air-conditioner system.