The　gas　diffusion　layer　(GDL),　as　the　main　mass　transfer　carrier　in　a　hydrogen　fuel　cell,　transports　fuel　and　discharges　water,　the　only　by-product　of　the　electrochemical　reaction.　The　dispersion　process　of　water　in　the　pore　will　hinder　the　diffusion　of　gas,　thus　reducing　the　concentration　of　fuel　gas　at　the　catalytic　site,　resulting　in　the　decrease　of　the　electrochemical　reaction　rate.　In　this　paper,　the　effect　of　wettability　in　the　GDL　hole　on　the　water　transport　process　is　studied.　When　the　pore　wall　is　hydrophilic,　the　liquid　phase　is　affected　by　the　gas　phase　eddy　current　velocity　field,　and　the　particles　at　the　center　advance　to　the　edge,　forming　a　liquid　phase　interface　with　a　thin　center　and　thick　edge.　With　the　increase　of　the　wall　contact　angle,　the　curvature　of　the　three-phase　interface　increases,　the　wall　adhesion　decreases,　and　the　liquid　phase　is　more　likely　to　be　discharged.　When　the　contact　angle　is　130　degrees,　the　liquid　phase　almost　does　not　shift　in　the　hole　with　a　radius　of　5　mu　m.　With　the　increase　of　the　radius　or　inlet　pressure　difference,　the　liquid　phase　is　discharged　gradually,　and　the　discharge　rate　of　the　liquid　phase　is　only　related　to　the　wettability　of　the　wall.