▎ 摘　　要

NOVELTY - Preparing gas diffusion layer involves providing gas diffusion layer substrate, preparing a polymer material on the gas diffusion layer substrate, annealing the gas diffusion layer substrate under an inert gas atmosphere, performing hydrophobic modification on the gas diffusion layer substrate, and preparing microporous layer on the gas diffusion layer substrate. USE - Method for preparing gas diffusion layer used in fuel cell (claimed). ADVANTAGE - The method can simultaneously improve the hydrophobicity and the electric conductivity of the gas diffusion layer. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a gas diffusion layer is prepared by the method for preparing a gas diffusion layer.