Abstract: Based on the measured data of airflow dry-bulb temperature,wet-bulb temperature,air flow rate and air pressure from the stope and heading face in the underground of Zhaolou coal mine,its distribution and change rules before and after cooling system operation are analyzed.The results show that latent heat occupies more than 80% of the underground cooling load,for per unit airflow volume,the heat dissipating capacity in working face occupies above 50% of the cooling load in underground coal mine,etc,and then some of the highlights of underground mechanism cooling engineering design are expounded.