A　new　cooling　concept　for　high　power　LED　street　lamp　by　combining　the　heat　release　of　high　power　LED　with　two-phase　heat　transfer　heat　pipes　was　proposed,　and　in　this　paper　we　study　the　effect　of　heat　pipe　numbers,　fins　structure　and　ambient　temperature　on　the　performance　of　heat　dissipation　of　HP　heat　exchanger.　Through　experimental　results,　we　found　the　heat　pipes　number　plays　a　more　importent　role　on　the　performance　of　heat　dissipation　than　the　fins　material　and　the　final　surface　temperature　will　increase　with　the　environmental　temperature.