Three levels of evaporative cooling air conditioning system in the dry areas of engineering applications that use the three evaporative cooling air conditioning system,its better than the direct and indirect evaporative cooling air conditioning system-direct two evaporative cooling air conditioning system.In this paper,in Xinjiang's two-tube indirect and direct evaporative cooling system works three instances of the test,further analysis shows that two three-tube indirect and direct evaporative cooling air conditioning system operating performance.