A　two-dimensional　two-phase　non-isothermal　mass　transport　model　is　developed　in　this　paper　for　the　air　breathing　direct　methanol　fuel　cell(DMFC).　The　self-made　computer　code　is　used　to　simulate　the　heat　and　mass　transport　characteristic　which　is　coupled　with　electro-chemical　reactions.　The　effects　of　temperature　of　the　inlet　methanol　solution,　temperature　of　the　air,　and　the　feeding　concentration　of　methanol　on　the　performance　of　the　fuel　cell　are　investigated.　The　numerical　results　show　that　the　cell　performance　can　be　enhanced　at　a　higher　temperature　of　the　inlet　methanol　solution　and　the　air.　Cell　performance　at　the　higher　cell　current　densities　can　be　improved　with　a　higher　feeding　concentration　of　methanol.　©　All　Rights　Reserved.