Helical　bevel　gears　are　crucial　components　for　modem　precision　machinery　as　a　means　for　the　power　transmission　mechanism.　Based　on　the　movement　of　mutation,　the　tooth　equations　for　one　pair　of　nutating　helical　bevel　gears　with　double　circular-arc　are　developed　in　this　paper.　On　the　application　of　crown　gear,　the　mathematical　modeling　of　the　helical　bevel　gear　is　proposed.　After　the　3D　modeling,　the　visual　assembling　of　the　nutation　drive　is　completed.　Finally,　the　kinematical　and　dynamical　simulation　of　the　nutation　drive　is　accomplished.