Abstract：The stress field and plastic zone of the main roadway and the branch roadway from 225 to 625 m depth below ground level of Qixiashan mining in Nanjing are studied by using finite element method(FEM). It is shown that the main roadway and the branch roadway in Qixiashan mining in Nanjing are instable. The stress field and plastic zone of the roadway are analyzed under different supporting methods. The reasonable support patterns are proposed for the main roadway and the branch roadway from 225 to 625 m depth below ground level. For the main roadway and the branch roadway constructed in the surrounding rock，the support of shotcrete is suggested. Reasonable thickness of concrete is established. In addition，anchor-gunited supporting should be applied to the branch roadway constructed in the sandstone rock. Length and pattern of anchor and thickness of concrete are determined.
