Abstract: Taking Zhangzhuang Iron Mine as the engineering background，the stability and safety of high and large stope in the mining process are systematically analyzed by numerical simulation method. Based on the COMSOL simulation platform，a refined three-dimensional geomechanical model including surrounding rock，ore body and filling body is constructed to truly reflect the geological conditions and struc⁃ tural parameters of the stope. By simulating the mining sequence of "one mining one interval" ( taking 0204 and 0507 panels as examples )，the mechanical response of surrounding rock and filling body in the process of one-step mining and two-step mining is systematically analyzed from two dimensions of stress distribu⁃ tion and displacement evolution. The results show that the stress concentration occurs significantly in the cor⁃ ner of the goaf and the pillar area. After the mining of 201~205 rooms，the maximum stress value increases from 16.3 MPa to 24.3 MPa with the advance of mining. In the process of two-step mining，because both sides are filling bodies，their strength is much lower than that of the original rock，resulting in significant roof subsidence and floor heave in the goaf. After the mining of 501~505 rooms，the maximum displacement in Z direction is up to 18 cm，and the displacement in Y direction is up to 12 cm，the filling body continues to move towards the goaf，and there is a risk of spalling. The research results provide a theoretical basis and engineering reference for the stability analysis and safety control of stopes with large structural parameters under similar conditions.

Key words: high and large stope, stability analysis, numerical simulation