Abstract: In order to clarify the influential range of penetration-enhancing drilling holes, combined with the microseismic monitoring results, a variety of evaluation methods were used to analyze the microseismic events within the coal body around the boreholes in the process of hydraulic cavern drilling, and to determine the effective influential range of the monitoring object, while engineering test guidance was carried out to optimize the drilling arrangement scheme.The results show that: the number of microseismic events in each hydrodynamic cavern borehole in the air intake roadway of the Zhangcun coal mine 2802 working face and the range of microseismic events distributed in the holes were obtained; the reasonableness of the influential range of the hydrodynamic cavern drilling holes was analyzed in the field, and the optimization of the arrangement of the hydraulic cavern drilling holes was proposed on the basis of the optimization plan.The concentration in the optimized drill holes and the gas extraction concentration in the comparison drill holes are in good agreement, indicating that the optimized drill hole scheme has a better extraction effect and reduces the number of boreholes, which saves the mine's gas treatment costs.