Mass　transfer　at　the　interface　between　cathode　catalyst　layer　and　gas　diffusion　layer　can　directly　reflect　the　reactant　content　entering　into　catalyst　layer　for　the　electrochemical　reaction,　and　also　reflect　the　production　content　discharged.　Heat　transfer　inside　fuel　cell　has　a　strong　interaction　with　the　electrochemical　reaction,　so　temperature　distribution　affects　the　reaction　rate.　Investigation　on　the　heat　and　mass　transfer　at　the　interface　is　helpful　to　understand　the　influence　of　various　parameters　on　cell　performance.　In　this　work,　the　effect　of　four　different　parameters　on　heat　and　mass　transfer　at　the　interface　are　studied　using　a　3D　agglomerate　model.　The　results　indicate　that　more　platinum　or　carbon　loading　in　cathode　catalyst　layer　can　enhance　heat　and　mass　transfer　inside　the　cell,　but　more　loading　is　not　good　for　cell　durability.　The　influence　law　of　cathode　gas　diffusion　layer　porosity　or　ionomer　content　in　cathode　catalyst　layer　on　overall　cell　performance　is　various　under　different　voltages.　Larger　porosity　is　not　beneficial　to　the　uniformity　of　temperature　inside　the　cell.　More　ionomer　content　is　not　conducive　to　heat　dissipation.　The　findings　contribute　to　direct　the　designs　and　fabrications　of　membrane　electrode　assembly　and　flow　channel　structure　under　the　practical　utilization　situation.