In order to solve the lack of energy resources and environment pollution due to utilizing energy resources in the districts poor in heat resources, The technology of air-conditioning by a assorted water resources linkage-operation system has been put forward. This technology uses urban middling water and lake water as the main pollution-free cool and heat sources, uses tail geothermal water as the ancillary peak adjusting heat source, adopts water heating pump to extract the heat or cool energy from the assorted water for the heating or refrigerating of house. This paper describes the basic principle, technological flow and the required equipments of the said technology. The engineering application of this technology has covered the shortage of heating energy in 975 project of Tianjin successfully, and met the requirements of the 975 project in heating, refrigerating and domestic hot water.