This　paper　introduced　a　hump　rail　brake　equipment　which　used　the　Nd-Fe-B　permanent　magnet　as　the　energy　source　of　brake　force　and　the　control　theory　of　the　magnetic　circuit.　The　paper　focused　on　bringing　forward　a　design　theory　and　methods　of　the　key　permanent　magnetic　parts,　calculated　the　magnetic　circuit　and　simulated　the　magnetic　system　with　the　ANSYS　software.　Through　analyzing　the　results　of　the　machined　model　parts,　this　equipment　reached　the　actual　application　level　and　provided　a　new　economic　energy　solving　scheme　for　hump　velocity　control.