In the field of fuel cells, nano-carbon fiber membranes can be used as gas diffusion layers. Compared with traditional carbon paper, nano-carbon fiber membranes have more pores and smaller sizes, which can allow the reaction gas and reaction products to pass smoothly and continuously. The flexible conductive fiber network not only ensures good electrical and thermal conductivity, but also ensures good contact with the catalytic layer and the bipolar plate; used as a fuel cell catalyst carrier, the nano-carbon fiber membrane has compared with the traditional Pt/C slurry catalytic layer More catalytically active sites and three-phase interfaces can achieve higher catalytic efficiency, and a continuous conductive network helps to obtain greater current density.