Abstract: This study uses the finite difference software FLAC^3D to simulate the situation of mining roadway at Liyazhuang 220 working face. The study establishes a numerical calculation model, and detailedly analyzes 8 kinds of bolt supporting method corresponding to the roof separation value and the change laws of roof separation value changing with different parameters of anchoring. The roadway support design parameters are determined, an the rationality and reliability design of roof separation control is improved.