Abstract: In order to solve the problem of serious deformation of roadway with large section secondary dynamic pressure, this paper takes 3103 auxiliary transportation lane of Chahasu Coal Mine as the engineering background, analyzes the deformation characteristics of 3103 auxiliary transport roadway caused by the mining in 3103 working face, and proposes the combined support scheme of “bolt + anchor + steel + metal net” based on observation data. Numerical simulation and industrial experiments show that this scheme can effectively control the deformation of large section secondary dynamic pressure roadway within controllable range; after the treatment, the subsidence height of the roof of the auxiliary roadway is 23.5 mm, and the deep part is arched and dissociated, and the dissociation range is 15 mm to 20 mm; at equilibrium, the maximum deformation of both sides of 3103 auxiliary roadway is 75 mm, within the controllable range.