Abstract: The displacement and deformation of mining slope with different inclination angles were analyzed based on FLAC^3D numerical simulation. The strength reduction method is used to calculate the slope safety factors of different inclination angles before and after coal seam excavation, and the slope stability is analyzed. Research shows that the greater the slope angles, the greater the mining influence and displacement. The maximum vertical displacement concentrates at the foot of the slope at different inclination angles, and the maximum horizontal displacement transfers to the top of the slope as the slope angles increase. The bigger the slope inclination angles is, the lower the safety factor is. After coal seam mining, the maximum safety factor is 1.22 when the slope is 30°, and the minimum safety factor is 0.73 when the slope is 75°. When the slope angle is greater than 60°, the mining slope is in a state of vulnerability to instability, and necessary slope control measures should be taken.