In　order　to　overcome　the　complicated　structure　and　high　prices　of　the　hydraulic　retarder　and　the　serious　thermal　recession　problem　of　braking　torque　of　the　conventional　eddy　current　brake,　a　self-excited　and　liquid-cooled　eddy　current　retarder　(SL-ECR)　structure　was　proposed.　The　model　of　braking　system　and　generating　system　of　the　SL-ECR　was　established　and　the　magnetic　circuit　structure　was　analyzed.　The　electromagnetic　field　model,　the　braking　performance　and　thermal　field　of　the　SL-ECR　were　analyzed　by　using　finite　element　method.　A　2000　N·m　SL-ECR　was　produced　and　tested.　The　braking　performance　and　the　generator　performance　were　tested.　The　results　show　that　the　difference　between　the　finite　element　analysis　results　and　the　experiment　results　was　6%.　The　temperature　of　the　water　wipe　was　85　when　the　braking　power　was　180　kW.　The　braking　torque　decreased　by　10.4%　in　the　continuous　braking　stage.　The　braking　torque　could　reach　2　000　N·m　when　the　speed　was　1　500　r/min　and　the　coil　current　was　30　A,　while　the　excitation　power　was　only　720　W　by　the　vehicle.