Heat　signals　can　evaluate　the　electrochemical　reaction　rate　and　heat　transfer　intensity　in　fuel　cells,　which　have　great　impacts　on　power　and　durability　of　fuel　cells.　In　this　study,　the　film　sensor　is　utilized　to　measure　the　temperature　and　heat　flux　of　fuel　cells,　and　the　difference　in　heat　characteristics　between　the　straight　channel　fuel　cell　and　the　orientational　channel　fuel　cell　is　studied　experimentally　for　the　first　time.　The　results　demonstrate　that　the　current　and　temperature　in　the　downriver　segment　of　the　straight　channel　fuel　cell　decay　and　fluctuate.　Therefore,　an　orientational　channel　with　baffles　and　tapered　flow　channels　is　designed,　and　the　evolution　and　distribution　of　interface　heat　signals　are　investigated.　The　results　indicate　that　the　orientational　channel　improves　reactant　transmission　and　alleviates　water　flooding　in　the　downriver　segment.　Thus,　current　and　temperature　increase,　leading　to　a　performance　improvement　of　16.9　%.　Temperature　and　heat　flux　positively　correlate　with　current;　however,　the　temperature　changes　exhibit　hysteresis.　Meanwhile,　changes　in　heat　flux　need　to　consider　both　heat　generation　and　heat　transmission.　In　comparison　to　a　straight　channel　fuel　cell,　the　performance　of　the　orientational　channel　fuel　cell　proves　more　adaptable　to　changes　in　operating　conditions.