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In order to solve the problem of high energy consumption of air conditioning in data center refrigeration system, the energy consumption of existing indirect evaporative cooling air conditioning was analyzed based on energy saving. The enthalpy difference laboratory was used to simulate different operation modes of air conditioning, and the influence law of outdoor dry and wet bulb temperature on total power and coefficient of performance（COP) of air conditioning unit was tested. Urumqi (dry area), Beijing (medium humidity area) and Guangzhou (high humidity area) were selected to simulate and analyze the annual operating time of “dry mode+wet mode” of the air conditioning unit, accounting for 95%, 74% and 36% respectively. At the same time, the annual accumulative power consumption is 296 662, 357 108, 490 169 kW·h respectively, and the annual accumulative power saving is 345, 738, 285, 292, 152 231 kW·h respectively, which has good applicability and power saving.