SDF series of energy-Tunnel Underground Railway axial fan is mainly used for air ventilation, can be used for railway tunnels, caves and underground engineering and building ventilation, is a high pressure, low noise, high efficiency axial flow fan . There is no current domestic dedicated fan of the series, and the rapid development of underground construction and it takes a lot of the status of imports, the use of advanced CAD system software, designed by the multi-objective optimization and general domestic underground engineering construction, the subway tunnel to match the leaf type and machine number, its technical performance indicators have reached or part of more than similar foreign products.