Abstract: In order to study the overlying strata and surface subsidence laws due to repeated mining under coal pillar group and reveal its formation mechanism, this paper, taking the geological mining conditions of 8104 working face of a mine as the engineering background, established three-dimensional geological mining model by using finite difference program FLAC^3D, and carried out numerical simulation experiments of overlying strata and surface subsidence under two conditions (mining only the upper coal with knife pillar method and mining repeatedly under coal pillar group ). The results show that only mining Jurassic coal, the overlying strata and surface subsidence is not obvious in the geological and mining conditions; repeated mining under the coal pillar group, the overlying strata destruction developed into “four zones”, namely from down to up in turn is caving zone, fracture zone, bending zone and caving zone; in the mine area, surface subsidence coefficient is smaller, subsidence basin range is larger and the surface subsidence is easy to form a non continuous movement and deformation.