Abstract: According to the difficult dilling and low drilling efficiency problems in soft and outburst seam of Zhaozhuang Mine, the selection principle of the drilling machine applied to soft and outburst seam was provided.After the improvement of the triangular prismatic drilling rod, a triangular drilling rod with the optimized cross s ection was designed.The cuttings removing mechanism of the triangular drilling rod was deeply analyzed.The FLUENT software was applied to the simulation and analy sis of the cuttings pneumatic removing in the smooth center of the drilling rod with same outside diameters.A comparison was conducted on the industrial trial effects fin ally.The study results showed that the new developed triangular drilling rod as the drilling tools of the drilling technology could be well suitable for the complicated geolo gical conditions of the soft and outburst seam and could obviously improve the drilling efficiency and reduce the accidents in the borehole.