Abstract: In order to solve the dust pollution problem from coal seam by air drilling,it studied the mechanism of catching dusts with atomized air-fine water in drilling,analyzed the effects of spray droplet and wind speed on catching coal dusts.It simulated seven kinds of flow field conditions by using the DPM model of CFD finite element software,analyzed the ration of less than 50 μm spray droplet and efficiency of removal dusts in different conditions.The results showed that: when the speed of wind at 23 m/s,the water mass flow at about 0.25 kg/s,it had the best effect for dust removal.