A　series　of　vortex　tube　nozzles　were　designed　and　fabricated,　and　the　effect　of　various　cross　sections　of　nozzle　and　the　number　of　the　nozzle　intakes　on　the　energy　separation　performance　of　a　vortex　tube　were　investigated　experimentally　by　using　air　as　test　fluid.　The　experimental　results　showed　that　the　vortex　tube　with　the　nozzle　cross　section　designed　in　this　study　was　superior　to　that　with　the　nozzles　of　normal　rectangle　cross　section　and　that　of　Archimedes＇　spiral　type　in　terms　of　regeneration　temperature　performance　under　the　condition　of　ambient　temperature　with　inlet　pressure　of　0.4　MPa.　The　cooling　performance　of　the　vortex　tube　with　four　intakes　nozzle　was　the　best　while　that　of　the　vortex　tube　with　eight　intakes　nozzle　was　the　worst　under　the　same　experimental　condition.