Based on the brief introduction and related test to exploitation and application of the evaporative cooling air conditioner for the sentry box of the first practical application in China, the temperature drop range of the prototype is 5.2~11.6 ℃ . The temperature drop effect of the prototype is analyzed. And it can meet the actual cooling demand of traffic police obviously. The water consumption of the prototype is 4.2,3.3 and 2.6 kg/h when running at high,middle and low level respectively. In view of the problems in the process of testing and the actual use process,did a corresponding improvement of evaporative cooling air conditioning,and the related experiments were carried out on the modified spherical vents.