Abstract: According to the feature of roadway under the protection coal pillar of close-distance seams in the SI Ke-shu coalmine,Through the method of numerical simulation and orthogonal test,Firstly research the effect of bolt length,spacing to the deformation of roadway,The result showed that bolt length’s range is 110 and spacing’s range is 33,and secondly analyze the deformation of roadway to different anchor length,The results showed that when the anchor length increasing between 4.5m and 5.5m the deformation of roadway increases with the increase of anchor length,but otherwise when the anchor length outride 5.5m.