In　heat　exchanger　heat　meter,　the　heat　exchanger　is　equivalent　to　a　flowmeter.　The　flow　and　heat　can　be　calculated　by　measuring　the　inlet　and　outlet　temperature　of　heat　exchanger.　It　greatly　prevents　the　flowmeter　from　the　problem　of　inaccuracy　and　damage　which　are　caused　by　the　quality　of　water.　However,　due　to　the　complexity　of　the　heat　exchanger　model,　it　is　difficult　to　get　an　expression　between　flow　and　temperature　through　analytic　methods.　This　makes　a　great　difficulty　to　design　and　optimize　the　structure　of　heat　exchanger.　To　solve　the　problem　above,　we　establish　a　three-dimensional　model　of　heat　exchanger　by　means　of　CFD　numerical　simulation　software.　By　solving　it　in　the　parallel　computing　platform,　we　get　the　relationship　between　flow　and　temperature　difference　ratio,　and　optimize　the　structure　of　the　heat　exchanger　by　means　of　pattern　search　method.　Simulation　results　show　that　after　using　this　optimization　method,　the　performance　of　heat　exchanger　has　been　effectively　improved.　©　2011　Shanghai　Jiaotong　Univ.