Abstract: Aiming at the problem of pre-drainage coal seam gas from directional long drilling in Yushutian Coal Mine in Xinjiang, combined with the parameters of No.5 coal seam and top and bottom slate, the gas fluid-solid coupling random seepage model of No.5 coal seam was established, the influence of length and spacing of directional long drilling holes on coal seam gas extraction was analyzed under certain negative pressure and extraction time.When the negative pressure of extraction remains unchanged, the total amount of gas extraction will increase with the increase of drilling length, but when the drilling length increases to about 650 m, the total amount of gas extraction tends to stable, and the reasonable length of directional drilling is 650 m; the larger the spacing between drillings, the smaller the amount of gas extraction. When the spacing between drillings increases from 5 m to 20 m, the amount of gas extraction decreases by about 5% to 7% with each increase of 5 m.