The main factors of fault slip are analyzed in this paper.A simplified model of thrust fault is constructed by FLAC 3D and the basic change law of elastic energy,vertical stress,shear stress and slippage of fault plane in the conditions of different distance from the fault,different fault dips and different throws is analyzed.And then the influence law of fault activation induced by coal extraction based on the characteristic parameters of thrust faults is revealed.The study results show that the elastic energy near faults will decrease with the distance increases from faults and will increase with fault dips or fault throws increase in the hanging wall or the footwall mining.But the focus level of elastic energy is high in the footwall mining.Vertical stress and shear stress variation of the different characteristic parameters is complicated.In a word,the increase of shear stress is obvious and the variation of vertical stress is not obvious.And the situation is prone to faults activation. Fault slippage will decrease with the distance increase from faults in the hanging wall mining or the footwall mining.And fault slippage will increase with fault dips increase and will decrease with fault throws increase in the hanging mining.If faces are mined in the footwall,the reverse results will show.