When wind force cutting pick-up drilling is applyed in coal seam if dedusting equipment is installed in the opening of the bore,it should enlarge drilling bore with ream bit so that dedusting equipment can be installed,and then retreat drilling and replace bit of drill.

Through theoretical analysis and experimental data,the effect of matching between piled anchor and drilling hole diameter on anchoring strength was described,and the most reasonable matching parameters of anchor diameter with drilling hole diameter were given.