The　distribution　of　oxygen　concentration　along　the　flow　channel　direction　is　uneven　in　a　proton　exchange　membrane　fuel　cell.　To　make　the　full　use　of　the　higher　oxygen　concentration　in　the　inlet　area,　the　platinum　loading　can　be　designed　to　be　gradient　decreasing　distribution　from　inlet　to　outlet.　A　two-dimensional,　nonisothermal,　two-phase　agglomerate　model　is　established　to　study　the　segment　number　and　segment　length　effects　on　heat　and　species　distributions　and　the　cell　performance.　Results　indicate　that　the　gradient　decreasing　distribution　of　platinum　loading　can　enhance　the　cell　performance　compared　with　the　uniform　distribution.　Furthermore,　increasing　the　segment　number　is　unfavorable　to　the　enhancement　of　cell　performance　but　can　make　the　temperature　and　oxygen　concentration　distributions　of　cathode　catalyst　layer　more　uniform.　Increasing　the　segment　length　near　the　inlet　area　can　make　the　cell　performance　improved,　whereas　it　is　unfavorable　to　the　temperature　distribution　uniformity.