Abstract: Deep tunnels are strongly affected by dynamic pressure, which is one of the many problems faced by deep mining in coal mines, and new methods urgently need to be explored to solve them. The burial depth of the 1303 transportation roadway exceeds 900m, and the roadway floor is mainly composed of soft rock layers such as sandy mudstone and mudstone. During the use of the roadway, the surrounding rock deformation is strong, and the floor heave is severe, which seriously affects the safety of the site. This article takes the 1303 transportation roadway as the research background, analyzes the mechanism of floor heave in dynamic pressure roadway, explores the technical parameters of floor heave control in dynamic pressure roadway, and verifies through on-site practice that after optimizing the support scheme, the deformation of the roadway floor, roof, and two sides are 155.76, 104.17 and 274.63 mm, respectively. The optimized scheme has good control over the surrounding rock of the roadway and effectively reduces the occurrence of floor heave.