Abstract: The complexity of geological conditions and destructive nature of coal mining operations lead to serious deformation and damage of surrounding rock of reused roadway, which poses a serious threat to the stability and safety of the roadway.Based on theoretical analysis and on-site monitoring data, elaborated the surrounding rock migration and deformation law and damage mechanism, put forward the reuse roadway reinforcement technology based on pier and pillar support, and analyzed the support strength of its “coal pillar-in-road support” joint support body.Taking 2204 transportation roadway of Dengmautong Coal Mine as the research background, the flexible mold pier pillar support technology, construction process and field application effect are described.Field monitoring results show that the flexible mold pier and pillar support technology can significantly reduce the deformation of the roadway surrounding rock, improve the stability and safety of the roadway.Compared with the effect of different support programs, the flexible mold pier and pillar support technology can effectively solve the problem of deformation of the surrounding rock of the reuse roadway.