Abstract: The paper adopts the point-pillar upward layered filling mining method on the basis of thecharacteristics of an iron mine such as inclined orebody, thick ore body , high-bench , rockmass stabilityand protection need to the surface. It also illustrates the mining technology of as designed. To ensure thereliability and rationality of safe use of the mining method, the stope structure parameters are as follows :the stope length is 40 m, the inter pillar 4 m wide, the spot pillar 5 m x5 m, and the net spacing betweenthe point pillars 8. 5 m. Stability of the stope with this structural parameter is simulated by FLAC3D soft-ware. Simulation results show that the stope structural parameters have certain feasibility , rationality andsecurity in the case of filling; the height of plastic zone produced by slicing operation is small, and thesurface subsidence deformation is very small, which indicates that the safety of mining with point-pillaiupward layered filling mining method will not present safety risks to the surface. lt is also proved that themining method has the advantages of high efficiency and low cost. The research results provide a theoreti-cal basis for the safe and efficient production of the mine.

Key words:  underground mining, pillar, stability analysis, filling body, surface subsidence