Abstract: In order to investigate the effect of high level drilling on the gas management in the goaf area, we establish numerical models of the working face and the goaf area by using Fluent software, and research on the migration law of gas content in the goaf area and the distribution law of gas in the high level boreholes.It is found that the concentration of gas in the goaf area increases horizontally from the inlet lane to the return air lane, vertically from the mining level to the fissure zone, and the concentration of gas in the deeper part of the goaf area from the working face is also in an increasing trend.Arranging high-level boreholes in the fissure zone of the coal seam roof can boost efficient gas extraction, expand the extraction range, reduce the gas content and pressure, and release the roof pressure.Simulation shows that the high-level boreholes can slow down the rising trend of gas in the goaf area to the return air side and the upper corner, inhibit the expansion of the high-concentration gas-rich zone, change the direction of gas migration, form a low-gas-concentration area centered on the boreholes, and reduce the concentration of gas in the return air side.Compared with the situation without high level boreholes, the gas concentration increasing curve is more moderate with high level boreholes, and the extraction effect is remarkable.