Abstract: In order to study strip coal pillar stability under the external disturbance in strip mining project, combined with the strip mining experience of Fengfeng Mining Area and Wannian Coal Mine under buildings actual condition, Zhuangyan village under the pressure of coal strip mining scheme is identified after a comprehensive analysis, and on basis of above, the FLAC^3D numerical model is established, the seismic waves on the strip mining of rock stability influence is analyzed by using the dynamic time-history analysis method. According to Mohr-Coulomb with tensile constitutive relation, the stability of strip coal pillar unit is judged by using yield strength criterion. The unit safety coefficient of the strip coal pillar is gotten. The strip coal pillar stability is reduced after earthquake, so the exploitation of design must be considered in the process of dynamic load effect.