To　improve　the　efficiency　of　the　liquid　metal　magnetohydrodynamic　(LMMHD)　generator,　a　new　type　of　magnet　structure　of　LMMHD　system　is　designed　in　paper.　The　internal　magnetic　gathering　capability　is　enhanced　by　imitating　the　arrangement　of　the　Halbach　array　magnet.　The　magnetic　induction　intensity　of　conventional　magnetic　channel,　Halbach　magnet　channel,　and　the　new　type　of　magnet　channel,　which　is　derived　from　basic　Halbach　are　compared　via　ANSYS　Maxwell　2D　model.　Simulation　results　show　that　Halbach　magnets　have　better　capacity　of　magnetism　gathering　and　are　more　efficient　at　gathering　electricity　than　conventional　methods.　The　new　type　of　magnetic　has　advantages　of　small　size,　low　cost,　high　induction　intensity,　high　output　voltage　and　high　power.