Abstract:The st rata failure process is simulated with multi2coal st rata mined by St rata Failure Process Analysis System , which is developed by ourselves. The result of numerical simulation reveals that though the upper pillar changed the st ructure of overburden st ratum , the st ratum failure is of periodic law and surface subsidence of sym2 met ry obviously with the advance of longwall face. Large2scale failure may cause large sub2weighting to affect the longwall face , when the height of failure arrives at upper pillar. Compared with similar material model test and theoretical analysis , the numerical simulation reflect s the dynamic progress process of mining rock. It is pointed out that SFPA2D is a new approach to research the rock st ratum movement .