Abstract: In this paper, FLAC is adopted to simulate the surrounding rock stability of a belt drive conveyor cavern of Yangquan mine district during excavation and support by steps. The research results show that the bolt/steel mesh/shotcrete support system which use the long anchor cable as the chief support method could keep a long team safety stability of the surrounding rock of cavern, and the preliminary design of the support parameters can meet with the deformation demands. The floor and roof are the relatively weak parts of the cavern, so some adequate measure should be taken to assure stability during construction and the long team of the cavern.