Abstract: The structure and performance of underground-perfusion concrete-filled steel tubular support was introduced systematically. Next, in order to solve the difficult supporting problem of severe deformation of soft rock roadway, under the background of third level substation of Hebi No.3 Mine, composite support design type of concrete-filled steel tubular support combined with bolt-mesh-shotcreting was proposed by means of field research, theoretical calculation and in-situ monitoring. The results show that the bearing capacity of CFST support can reach 1.29 MPa, the composite support can effectively inhibit the convergence deformation of weak surrounding rock, and the engineering application effect is good with the final deformation of surrounding rock less than 80 mm after supporting stable.