Based on the two sides of roadway destruction form and law, roadway rib department deformation and fracture mechanization was analyzed, through the theoretical calculation and FLAC3D numerical simulation, prestressing force total length of anchor two sides of roadway reinforcement was revealed, prestressing force total length of anchor influencing shear resistance was discussed, the result showed that prestressing force total length of anchor two sides of roadway was effective for shear failure reinforcement, with engineering verification.