An　energy-efficient　magnetic　track-eddy　current　composite　brake　(MT-ECB)　for　high-speed　trains　is　proposed　in　this　study.　It　has　two　modes:　the　magnetic　track　working　mode　and　eddy　current　working　mode.　First,　the　structure　and　operating　principle　of　the　composite　brake　are　introduced.　Subsequently,　a　multiobjective　optimisation　process　of　the　major　structural　parameters　was　conducted　with　the　consumed　PM　volume,　electrical　excitation,　and　magnetic　attraction　force　as　optimisation　objectives.　A　Kriging　surrogate　model　for　the　MT-ECB　was　established.　Optimal　Pareto　front　solutions　were　acquired　by　adopting　the　non-dominated　sorting　genetic　algorithm　II　(NSGAII),　and　the　optimisation　results　were　verified　via　a　3-D　finite　element　simulation.　After　the　optimisation　of　the　MT-ECB,　the　consumed　PM　volume　decreased　by　18%,　and　the　power　consumption　was　reduced　by　21%.　The　electric　energy　consumed　per　1000　N　of　the　eddy　current　braking　force　decreased　from　4　kW　to　approximately　2　kW,　resulting　in　a　remarkable　energy-efficient　effect.