Abstract: In order to solve the surface subsidence problems caused by the excavation of working face with a shallow buried depth and great mining height, we uses the theoretical analysis and numerical simulation to research the dynamic law of overlying strata separation layer at F6201 working face in mining, and draws a conclusion that mining stripe width of strip zoning separated layer grouting should be less than the limit span arch; the best position of abscission layer grouting hole is located in the main key stratum of maximize interface abscission layer development space; the best time of drilling grouting should be at time that the mining span reaches the equilibrium arch span, when the abscission growth just achieves the full state. Field practice result shows that the coefficient of surface subsidence-reducing can reach 79.35%.