Abstract: This paper taking No.3 coal seam in Changcun Coal Mine as the research object,FLAC^3D numerical simulation software was used to simulate the mining response of the surrounding rock in the working face of rock cross-cut uncovering of No.3 coal seam in this mine,the displacement of roof and floor of coal seam and the distribution of vertical stress in the working face were analyzed.The results show that the stress peak area is in the region that from 2 m to 6 m in rock cross-cut working face,and the stress concentration coefficient is from 1.29 to 1.39,furthermore,the stress concentration coefficient is inversely proportional to the distance between rock cross-cut and coal seams,the distribution law of the surrounding stress in the course of rock cross-cut uncovering is obtained.According to the results of numerical simulation,the anti-protrusion measures of metal skeleton advanced support adopted in the working face of the rock cross-cut uncovering obtain good effect.