Abstract: Taking coal mining-landslide geological disasters of a mine in Guizhou as the engineering background, the article summed up the characteristics of mountain areas in southwest shallow seam, calculated the safety factors with finite element strength reduction. FLAC^3D numerical simulation software was used to simulate in shallow seam on the mountain slope stability. The study results showed that plastic zone at the top of the mined-out area continuously developed (especially in the location of the foot of the plastic zone increased significantly) with the gradually mining of 3022 working face when the plastic zone at the top of the mined-out area was not comprehensive, the mine slope was prone to landslides local; when the plastic zone at the top of the mined-out area was comprehensive transfixion, and combining with rainfall infiltration and weathering, mine landslide was prone to overall landslides.