Abstract: To effectively control the deformation and instability failure of the mining gateway under the goaf in deep coal seams, taking the case of 209 working face transportation roadway in Longde Mine and adopting the mechanics of the roadway under goaf by field monitoring, theoretical analysis and numerical simulation, a combined support technology with grouting, full anchor cable and rack shed is proposed, and then the grouting parameters and support parameters are proposed. Research indicates that under the influence of great horizontal stress, the surrounding rock of the roadway was experienced bending and tensile failure, the roadway is deformed and unstable when tensile stress of surrounding rock is greater than the tensile strength of the coal rock; the area of the surrounding plastic zone was significantly reduced, and the stress concentration range of the roof and floor is decreased; the surface displacement of the roadway is effectively controlled after the support of the roadway, the deformation rate of the surrounding rock of the roadway tends to be stable after ten thousand steps, and the displacement of the roadway are basically stable at two thousand steps, the supporting effect is relatively efficiency.