Orientated-type　flow　channels　of　proton　exchange　membrane　fuel　cells　having　baffles　increase　the　cell　performance,　however,　the　higher　power　loss　accounted　by　baffles,　is　a　non-ignorable　disadvantage.　Previous　literature　proves　that　the　baffles　in　channels　cause　the　increase　in　power　losses,　while　how　the　baffles　affect　the　power　losses,　including　the　frictional　losses　and　local　losses,　are　still　not　analyzed　before.　Therefore,　in　this　paper,　a　two-dimensional　model　is　developed　to　study　the　friction　loss　and　local　loss　in　the　flow　channels　with　baffles.　The　numerical　model,　which　couples　the　non-Darcy　flow　effect,　is　validated　by　comparing　with　self-conducted　experimental　results.　Experimental　and　simulation　results　reveal　that:　orientated-type　flow　channels　facilitate　enhance　the　power　output,　and　with　the　enlargement　of　baffles,　the　performance　is　further　enhanced.　In　addition,　the　frictional　losses　and　local　losses　in　the　orientated-type　flow　channels　are　comparatively　studied　by　a　numerical　approach　for　the　first　time.　It　is　found　that　using　the　materials　with　low　surface　roughness　can　decrease　the　friction　loss;　and　avoiding　sudden　expanded　segments　at　leeward　sides　of　baffles　can　reduce　the　local　loss.　The　experimental　results　and　simulation　results　can　further　help　improve　the　flow　channel　design.　(c)　2021　Elsevier　Ltd.　All　rights　reserved.