Abstract: To reveal the frequent occurrence of coal-rock gas dynamic disasters in the adjacent fault and coal-thickness variation area, based on the typical coal and gas outburst accident in Panyi Coal Mine, the mechanical mechanism of coal and rock dynamic disaster under the influence of superposition of fault and coal thickness variation area was studied by combining field practice and numerical simulation. The distribution laws of stress field that the working face mined from thick to thin coal seam near the fault and the face mined from thin to thick coal seam away from the fault were revealed. The view that the face mined from thick to thin coal seam near the fault is easier to induce dynamic disasters of coal and rock gas was proposed.