1． College of Construction Engineering，Jilin University，Changchun 130026，China; 2． School of Petroleum Engineering，China University of Petroleum，Qingdao 266555，shandong，China

Air DTH hammer has been successfully applied in minor-caliber solid mineral exploration，waterwell drilling and other drilling areas． In order to expand the applications of the technology，the authors further studied the principle and analyzed the mechanism of reverse circulation drilling technique with air DTH hammer to get the perfect assembles of equipments by optimizing working parameters． No parameter seemed more important than the air volume because it could maintain the working performance stability． The minimum air volume is related to the parameters such as depth and pressure，which was calculated under the actual conditions． It was solved for the air injection flow tables of the air DTH Hammer working at the different pressures． According to the data tables，operators could adjust the air volume to meet the demand on this technique，which had a realistic guiding significance． So it could build up a set of systematic and complete hi-technique．