In mine exploration， traditional core drilling has problems such as long drilling period and high cost， while air reverse circulation drilling has high drilling efficiency and low cost. In this paper， the fluid structure of the drill bit and the packing sleeve for air reverse circulation drilling has been improved and applied to mine exploration. Compared with traditional core drilling， air reverse circulation drilling has increased drilling efficiency by 70%~90% with costs reduced by 30%~50%， the drilling accident rate reduced by 60%~70%， no mud pollution in the drilling process， and less dust， meeting the requirements of green exploration.