The technology of aquifer thermal energy storage(ATES) uses a low-medium enthalpy geothermal energy as heat or cold sources.While refrigerating or heating for building,the heat or cold energies will be stored in the energy storage well with the cycle of the system so as to bring about the desired result that the energy from summer is utilized in winter and the energy from winter is utilized in summer.The technology of large temperature difference water source heat pump(WSHP) improves the WSHP units’ energy efficiency ratio by increasing the temperature difference between in/back water.The combined use of these two technologies can take advantages of them more effectively,to achieve the saving and efficient utilization in water resources.Taking the WSHP project in some unit as example,this paper introduces the application of these two technologies in engineering.