Abstract: Untimely treatment of goaf which left after underground mining of deposit could influence the mine safe production and daily life of people living around. Scientific goaf treatment must be based on stability analysis of goaf. Taken an iron ore as the example, on the basis of establishment of goaf three-dimensional numerical model, through analysis of factors like maximum principal stress of goaf, shear risk degree and so on, it can be concluded that the whole goaf group was stable and local unstable. It provides scientific basis for treatment of this goaf.

Key words: Goaf, Stability, Numerical simulation, FLAC^3D