Abstract: Aiming at the technical problems of low gas extraction efficiency and long extraction period in medium-hard coal seams, as well as high crack initiation pressure and uncontrollable crack propagation in conventional hydraulic fracturing, taking the regional gas control of Huangling No.2 coal mine as the background, the gas control technology of directional long borehole 'perforation-fracturing 'composite permeability-increasing area was systematically studied by means of theoretical analysis, numerical simulation and field test, and the resistance reduction and guidance mechanism of perforation (nozzle diameter 3.0mm, perforation pressure 5MPa) as the pre-fracturing guide was analyzed. A regional gas control technology scheme with 'segmented+overall' fracturing as the core is formed (fracturing interval is 30~50m, single-stage liquid injection≥80m3). The results show that the ' perforation-fracturing ' technology can effectively control the coal seam initiation pressure at 11.5~13.7MPa, which is about 30% lower than the theoretical value. The maximum radial extension distance of fracturing fracture is 50m, and the range of permeability enhancement is significant. After the composite anti-reflection, the average amount of gas extraction per 100meters of the borehole is 0.226m3/(min·hm), which is 2.9 times and 3.8 times that of the slotted borehole and the ordinary coal seam borehole, respectively. The gas extraction concentration is stable at 67%~100% for a long time, and the extraction amount is 0.84~1.93m3/min. The research results can provide theoretical basis and engineering examples for efficient gas extraction in similar medium-hard and low-permeability coal seams.