On the base of the background around world and the economics analyzed to one architecture in Chongqing, the essay compares Ice storage Air-condition (ISA) with conventional Air-condition in both beginning investment and annual-running-fee. The comparision show, that the ISA is more higher in beginning-investment, but 37% lower in annual-running-fee and regains interest after three years. It is analyzed that the development of ISA can promote the rate of electricity system, spare room and promote the quality of in-door air etc. It is available to develop the ISA in Chongqing. The policy of counting electricity-fee in different time, the economics-analysis method and the development of focusing the cold source are suggested.