An　experimental　setup　of　two-phase　cooling　loop　driven　by　magnetic　pump　was　built.　The　performance　and　start-up　characteristics　of　the　two-phase　cooling　loop　are　evaluated　by　the　air　enthalpy　difference　method.　Experimental　results　show　that　the　two-phase　cooling　loop　driven　by　magnetic　pump　presents　excellent　performance　for　energy　saving.　Its　start-up　is　quick　and　the　system　reaches　a　steady　state　after　600　s.　The　fluctuations　of　pressure　and　temperature　in　the　system　are　caused　by　the　superheat　of　the　liquid　refrigerant　in　the　evaporator　during　the　start-up.　The　cooling　capacity　of　the　system　increases　with　the　temperature　difference,　and　increases　rapidly　with　the　mass　flow　rate　and　then　decreases　slowly.　When　the　temperature　difference　is　10,　the　maximum　cooling　capacity　is　3.429　kW　and　the　energy　efficiency　ratio　is　12.94.　When　the　temperature　difference　is　25,　they　reach　9.241　kW　and　29.7,　respectively.　©　All　Right　Reserved.