Taking the-190 level southern roadway in Gequan coal mine in China as the object of study,the numerical analysis of stress distribution,plastic zone,displacement of surrounding rock and stress state of rock-bolt under the conditions of both shotcrete-bolt support and combined bolting-shotcreting-grouting support was carried out with UDEC software.The result shows: the stress state of rock-bolt can be improved by grouting surrounding rock;combined whole section bolting-shotcreting-grouting support can improve the stress distribution,and can decrease the size of plastic zone in surrounding rock,resulting in a loop bearing structure near by the periphery of roadway and the long-term stabilization of the surrounding rock.The engineering practice shows that the support scheme determined by numerical simulation is reasonable.