Abstract: We use numerical simulation software FLAC^3D to establish the different width of roadside packing body model, simulated the corresponding filling body vertical displacement and roof and floor and coal rib displacement. Through the simulation in three ways of the lane strong cutting prop, we analyzed the gob overburden stress variation and gob change law of overlying strata displacement. The numerical simulation indicates that lane cutting roof supporting prefers strong single pillar roof cutting mode, the supporting system has strong supporting capacity, and the movable column has certain flexibility and can maintain constant support resistance.