Abstract: In order to study the impact of the coal mining process on slope stability,using the strength reduction method,the slope stability of different physical and mechanical parameters under coal mining conditions were calculated and analyzed,the safety factor of slope cohesion c under different discount percentages is received.Using Mohr-Coulomb strength criterion to analyze the stress of each node,which is calculated by the ANSYS software.The plastic zone and the sliding surface location in different physical and mechanical parameters of the slope are received.The results show that the greater degree of coal mining disturbing to the slope,the more decreasing in the physical and mechanical parameters of slope,and the smaller corresponding safety factor is,in a certain range,safety factor linearly changes with the decrease percentage of cohesion.