In　order　to　overcome　the　braking　performance　thermal　recession　problem　of　the　conventional　permanent　magnet　eddy　current　brake　(PM-ECB),　a　new　type　of　PM-ECB　is　designed　by　using　water-cooled　method.　The　structure　and　working　principle　of　new　type　PM-ECB　are　presented,　and　the　characteristics　of　the　cooling　cycle　system　are　highlighted.　To　prevent　the　magnetic　saturation,　the　magnetic　field　distribution　is　obtained　by　using　magnetic　field　finite　element　method.　The　relationship　between　static　suction　and　magnet　thickness　is　shown　by　magnetic　circuit　method.　There　is　nearly　linear　relationship　between　test　braking　torque　and　calculation　suction　by　fitting　data.　The　temperature　and　braking　torque　of　the　two　types　of　devices　are　tested.　The　calculated　temperature　agrees　fairly　well　with　the　measured　results.　The　results　show　that　the　water-cooled　PM-ECB　maintains　low　working　temperature,　braking　performance　does　not　occur　thermal　recession　and　the　continuing　work　capacity　is　improved　greatly.　©　2011　Journal　of　Mechanical　Engineering.