Abstract: Numerical simulation software FLAC3D is used to simulate the stress, deformation and displacement of 12041 working face and up and down crossheadings before and after the excavation. After the excavation of the tunnel, the tunnel roof and floor releases pressure within a certain range, and appears tensile stress area. stress concentration appears in roadway intersections and ten meters in front of the square. The simulation process found a hard rock, the sixth sandstone.