Abstract: In order to eliminate the influence of the coal column left over from B4 coal seam of Kuanggou coal mine on the lower coal seam,Through the combination of theoretical calculations and numerical simulation analysis.The law of stress transfer in the floor of the pillar left behind after mining the W1145 coal face in Upper Coal Seam and the stress distribution the W1123 coal face in the lower seam ? during the mining process were studied,Research results show that:The stress and deformation concentration area of after mining is 16.7m in B4 coal seam;Under the action of vertical stress of coal pillar, when the lower coal seam is 60 m away from the coal pillar, the stress in coal and rock mass increases obviously, and reaches the peak value when the distance remains 30 m;After entering the goaf, the stress of coal and rock mass decreases rapidly, and restores to the pre-mining stress level after being 30 meters away from the coal pillar, The influence range can reach 140m.In order to eliminate the influence of coal pillar stress, The roof is comprehensively treated by pre-splitting blasting and transverse roof cutting in two Coal seam roadway .