In general, tunnels in very poor rock are driven by the short bench cut method. However, to limit the deformation of tunnel side walls and roof, the micro bench tunneling method, utilizing face bolts as auxiliary measures, will be required. From this view of point, three dimensional finite difference analysis was carried out to simulate the rock behaviors around the tunnel face. Analytical results indicate that fully grouted face bolts are available to reduce the deformation of the tunnel face, and the extent of the plastic zone around tunnel face.