The　transfer　processes　of　reactants　and　products　affect　each　other　in　proton　exchange　membrane　fuel　cells　(PEMFCs),　because　they　have　contrast　transfer　directions　between　flow　channels　and　gas　diffusion　layers　(GDLs).　In　this　study,　a　two-dimensional,　two-phase,　non-isothermal　and　steady　state　model　is　developed　to　analyze　the　species　transportation　behaviors　through　diffusion　and　convection　in　PEMFCs　with　orientated-type　flow　channels.　Five　conventional　shape　baffles　effects　on　mass　transfers　are　compared,　and　the　relationships　between　convection　and　diffusion　of　reactants　and　produced　water　vapor　are　discussed.　Simulation　results　reveal　that　baffle　shapes　affect　the　mass　transportation　through　the　baffles　leading　angles　and　volumes,　and　larger　leading　angles　enhance　the　reactants　and　the　water　vapor　convective　transferring　into　GDLs;　meanwhile,　larger　baffle　volumes　enhance　the　reactant　transferring　into　GDLs　and　water　vapor　transferring　out　from　GDLs　through　diffusion　processes.　In　addition,　transportation　processes　of　reactants　and　vapor　affect　each　other,　where　more　reactants　convectively　transferring　into　GDLs　causes　more　water　vapor　entering　GDLs;　enhancing　the　reactants　diffusively　transferring　into　GDLs　reduces　water　vapor　diffusive　transportation　out　from　GDLs.