Orientational　flow　channels　having　baffles　with　proper　shapes　enhance　the　reactant　transportation　and　facilitate　improving　the　performance　of　proton　exchange　membrane　fuel　cells.　For　the　purpose　of　further　increasing　reactant　supply　into　the　membrane　electrode　assemblies,　blocks　with　different　porosities　can　be　constructed　between　baffles　and　gas　diffusion　layer　surfaces.　It　has　been　known　that　using　orientational　flow　channels　having　baffles　with　porous　blocks　can　further　enhance　the　reactant　transporting,　however,　the　transporting　process　of　reactants　from　channels　into　gas　diffusion　layers　includes　diffusion　and　convection　processes,　and　how　the　diffusion　and　convection　transporting　processes　perform　in　such　channel　structure　is　still　unknown,　which　is　probably　beneficial　to　better　understanding　the　mass　transferring　strategy　in　the　cells　whose　channel　spaces　are　blocked.　In　the　present　study,　a　two-dimensional,　two-phase,　non-isothermal,　and　time-independent　corrected　model　adding　non-Darcy　flow　influence　is　employed　to　numerically　study　reactant　and　products　transportation　strategy　by　using　orientational　flow　channels　having　porous-blocked　baffles.　The　diffusion　and　convection　of　species　are　separately　discussed.　Simulation　results　reveal　that　by　distributing　blocks　with　different　porosities,　the　convective　flux　of　reactant　is　enhanced　significantly,　as　a　result,　the　main　transporting　approach　switches　to　convection.　However,　produced　water　vapor　removal　is　weakened　due　to　porous　blocks.