Abstract: In Huainan Mining Area, to reduce the risk of uncovering coal and shorten the schedule, air-cavitation technology, for the first time, was used to loop out the coal through surface borehole drilling in Wangfenggang wellbore of Xieyi Coal Mine, which uses air compressor to build the pressure and blow off periodically. Through air circulation well-flushing, the surface borehole drillings took out dry pulverized coal 302.02 m³（about 420 t）, and extracted pure gas volume about 47 854 m³. Area for uncovering coal gas extraction rate is more than 10% . Gas content and gas pressure was reduced by 58% and 60.8% respectively. In conclusion, air-cavitation technology reduces the risk of uncovering coal effectively and plays an additional role in elimination outburst.