Experimental　and　numerical　studies　were　carried　out　on　the　flow　and　heat　transfer　characteristics　of　a　plate-fin　heat　exchanger.　The　temperature　and　pressure　fields　in　each　section　of　the　heat　exchanger　were　obtained　by　means　of　numerical　simulation.　Some　performance　parameters　of　the　plate-fin　heat　exchanger,　such　as　Nusselt　number　Nu,　surface　heat　transfer　factor　j,　friction　factor　f　and　power　factor　α*,　under　various　working　conditions　were　obtained　both　numerically　and　experimentally.　The　variation　curves　of　these　parameters　with　Re　are　plotted.　The　results　indicated　that　Nu　and　α*　increase　with　increasing　Re,　while　j　and　f　decrease　with　increasing　Re.　The　correlations　of　Nu,　α*　and　f　with　Re　were　obtained　for　the　design　of　plate-fin　heat　exchanger.