Abstract: The coal entry’s roof and floor of Heigou Co．Ltd were soft strata．It was analyzed in theory and numerical simulated by Flac3D software of the surrounding rock weak structure deformation and bolting support mechanism that in order to resolve the serious deformation of the coal entry under shallow depth．The results show that the clamping action produced by bolting support result in the formation of arched support body of shallow rock which enhance the self-bearing capacity and integral stiffness．It is the floor corner bolts which play an important role in controlling the heave that induce floor peak stress area shift to the deep and reduce the stress-floor heave degree．The anchor cable supports reduce the tensile stress area and strata damage degree and increase the integrated stability of roof-floor seam．The flexible structure formed by steel belt and metal mesh prevent the damage develop to the deep．The combination of bolt and cable and wire-netting can achieve the effective support of the large deformation coal entry with soft roof and floor．

Key words: soft roof and floor, large deformation, coal entry, combined support