The freel cooling system on the refrigerant side uses the outdoor free cooling resources to improve the energy saving of the data center. In this paper

the energy consumption model of air conditioning system is established

and the energy saving potential of the system can be analyzed by combining the typical data center and weather data. Under the cooling requirements of the data center

the application of energy-saving technology of air conditioning system can be expanded by using appropriate refrigerant pump

and the utilization time of free cooling source can be extended throughout the year

and it can be applied in different use areas.