According to the characteristics of fire area treatment in the Changyuan coal mine of Zhenghui coal industry business, the test requirements of coal mining by rotary drilling rig are put forward in steep coal seam. But in the inclined state, auger mining is of non-normal working condition, the comprehensive assessment on rig shaking amount, shaking amount of the whole working machine, fluctuations of each drilling parameter, wear of power head drive key, deformation degree of drill mast and the efficiency of coal mining. Based on the test results of drilling tool of 4 different diameters, the optimal choice of conventional drilling tool diameter is obtained and the discussion is proposed on the feasibility of “mini-invasive” treatment by using rotary drilling rig full guard barrel operation in the coal belt of fire area.