Abstract: Taking 0403 working face as the engineering background, through theoretical analysis, numerical simulation and field measurement method, the distribution characteristics of fracture zone height, the distance of first weight and periodical weight, and the fracture distribution of mining overburden are studied on the coal seam of No.4 coal seam. Then, it is used to guide the drilling design. The field practice shows that: through arranging the reasonable drilling in the overburden fracture zone, the concentration of single hole in extraction gas can reach 32% to 55%, and the degree of purity can be maintained at 0.15 m3/min to 0.24 m³/min, and the upper corner gas concentration can be reduced by 65%, the return air reduced by 69%. It effectively solves the problem of high gas concentration in the return air and upper corner of the working face. At the same time, it is also found that the drilling can play a role of 10~20 m in advance.