Abstract: Taking the fully mechanized caving face 15101 in Xindadi coal mine，Shanxi province as the research object，we have studied the strata movement rules of the face and the characteristics of pressure-relief gas drainage in adjacent seam，determined the arrangement principle of layer-through boreholes in face 15101．In addition，6 optimization schemes were proposed，and the associated numerical simulations were conducted by using FLUENT．According to simulation results，the optimal arrangement parameters of layer-through boreholes in adjacent seam were determined finally．The results show that the vertical height of final hole to the floor of 15# coal seam is 50 m，and the horizontal distance of final hole is 20 m deep into the face．After the parameter optimization，the gas extraction of adjacent seam in face 15101 has obtained a favorable effect，and the average gas extraction quantity is up to 51.8 m3/min．

Key words: layer-through borehole, gas extraction, CFD simulation, green mining