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Aiming at solving the problems of large gas emission and difficult control of working face in single, high-gas and medium -thick coal seam, the author prefers the drainage way of head-on along layer drill hole by comparing several kinds of drainage ways. Based on analyzing all kinds of factors affecting drainage result, such as the arrangement of drill hole ,the span of drill hole, the depth of sealing hole, drainage negative pressure and drainage duration, The author designs gas drainage at working face in single, high-gas and medium-thick coal seams. According to the author's gas drainage parameters in the design, it is summarized as follows: the rate is as high as 62.71% at working face; the great hidden danger to safety is reduced and it is great significant to control gas disasters in single, high-gas and medium -thick coal seam

Gas control technology of working face in single, high-gas and medium -thick coal seam