The overlying strata movement and deformation characteristics of inclined coal seam under three working conditions of different mining width were studied by using three-dimensional numerical simulation method.The results show that when the mining width increases from 80 m to 160 m, the stress at the interface between coal seam and rock layer changes little, and the surface subsidence rate in the extrusion deformation zone is slow.When the mining width increases from 160 m to 240 m, the stress changes at the interface between the coal seam and the rock layer are very significant, and the surface in the extrusion deformation zone causes obvious subsidence.Under different mining conditions, there is a peak value of subsidence displacement in the extrusion deformation area, which is located in the downhill direction of the mining area. The subsidence value in the extrusion deformation area is less affected by the horizontal stress, and the subsidence value in the strike and trend directions is symmetric with the peak value curve.