Flow　field　structure　can　largely　determine　the　output　performance　of　Polymer　electrolyte　membrane　fuel　cell.　Excellent　channel　configuration　accelerates　electrochemical　reactions　in　the　catalytic　layer,　effectively　avoiding　flooding　on　the　cathode　side.　In　present　study,　a　three-dimensional,　multi-phase　model　of　PEMFC　with　a　3D　wave　flow　channel　is　established.　CFD　method　is　applied　to　optimize　the　geometry　constructions　of　three-dimensional　wave　flow　channels.　The　results　reveal　that　3D　wave　flow　channel　is　overall　better　than　straight　channel　in　promoting　reactant　gases　transport,　removing　liquid　water　accumulated　in　microporous　layer　and　avoiding　thermal　stress　concentration　in　the　membrane.　Moreover,　results　show　the　optimal　flow　channel　minimum　depth　and　wave　length　of　the　3D　wave　flow　channel　are　0.45　mm　and　2　mm,　respectively.　Due　to　the　periodic　geometric　characteristics　of　the　wave　channel,　the　convective　mass　transfer　is　introduced,　improving　gas　flow　rate　in　through-plane　direction.　Furthermore,　when　the　cell　output　voltage　is　0.4　V,　the　current　density　in　the　novel　channel　is　23.8%　higher　than　that　of　conventional　channel.　©　2020　Hydrogen　Energy　Publications　LLC