Lattice　Boltzmann　method(LBM)　is　used　to　investigate　the　effects　of　gas　channel(GC)　wall　wettability　on　liquid　water　distribution　and　content　in　gas　diffusion　layer(GDL)　of　a　proton　exchange　membrane　fuel　cell(PEMFC).　The　effects　of　GC　wall　wettability　are　explored　by　simulating　liquid　water　transport　process　in　GDL　and　GC.　Simulating　results　reveal　that　GC　wall　wettability　significantly　affects　liquid　water　amount　in　GDL.　Compared　with　hydrophobic　GC,　a　hydrophilic　GC　leads　to　less　liquid　water　accumulated　in　the　GDL.　A　better　understanding　of　the　results　is　obtained　by　analyzing　the　pore-scale　dynamic　behaviors　of　liquid　water　with　special　attention　given　to　that　at　the　GDL-GC　interface.　The　simulation　results　suggest　that　in　future　study　of　liquid　water　transport　and　distribution　in　the　PEMFC,　effects　of　GC　wall　wettability　on　liquid　water　distribution　within　the　GDL　should　be　considered.　©　All　Rights　Reserved.