Abstract:A large number of goafs have been formed with the development of mining,. The stability of goaf is a serious threat to the safety of underground workers and affects the long-term development of enterprises. To ensure safe production, the stability analysis of the underground goaf was carried out by means of laboratory test, numerical simulation and theoretical analysis. Based on the Hoek-Brown criterion and the estimation method of strength parameters, the rock mechanics parameters of this mine were converted. Combining with the finite element numerical analysis software MIDAS/GTS NX and large three-dimensional mining software Dimine, the finite element three-dimensional numerical model was established to conduct finite element numerical simulation analysis of mining and goaf stability. It was concluded that the roof of some goaf had tensile stress failure, and the local maximum tensile stress was2.27MPa. No. 13 pillar produced main stress concentration and was in compressive stress failure. Only a few units of ore pillar around goaf presented plastic failure, and the plastic zone mainly existed in the goaf roof. The surface displacement settlement was small and the goaf was basically in a stable state.