Reactants　and　products　distribute　unevenly　in　flow　channels　of　proton　exchange　membrane　fuel　cells,　therefore,　the　baffle　heights　and　locations　in　flow　channels　exhibit　effects　on　species　transportation.　In　this　study,　a　two-dimensional,　two-phase,　non-isothermal,　and　steady　state　model　is　developed　to　study　the　baffle　heights　and　locations　effects　on　mass　transportation　and　performance　of　the　fuel　cells　with　orientated-type　channels.　Simulation　results　show　that:　uniformly　distributing　baffles　in　a　flow　channel　can　both　enhance　the　reactants　transportation　and　help　expel　more　liquid　water,　resulting　in　higher　net　powers;　although　using　a　big　baffle　at　the　upstream　segment　of　a　channel　enhances　the　performance　more,　while　the　water　accumulating　is　also　increased　more.　Reducing　the　baffle　heights　accounts　for　weaker　reactants　transfer　enhancements　and　worse　liquid　water　expelling;　moving　the　baffles　backwardly　also　causes　the　decrease　in　reactant　transportation,　while　the　liquid　water　expelling　process　is　increased.　(C)　2020　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.