With　virtual　prototyping　technology,　this　paper　establishes　the　3D　virtual　prototyping　model　of　AC　contactor　including　the　whole　contact　system,　core　system　and　connecting　parts.　It　reflects　the　real　dynamic　characteristics　of　AC　contactor　affected　by　the　structure.　Based　on　the　finite　method　of　continuum　mechanics,　the　nonlinear　contact,　collision　problem　and　elastic　material　deformation　have　been　taken　into　account　in　the　dynamic　analysis　software　Ansys/LS-DYNA.　Contact　bounce　in　the　process　of　contactor　action　is　simulated.　Moreover,　by　3D　visualization　window,　the　displacement　and　velocity　of　movable　contact　and　core　changing　over　time　are　obtained　and　the　dynamic　characteristics　of　contactor　are　analyzed　visually.　In　addition,　the　influence　of　closure　speed,　pre　force　of　spring,　properties　of　reed　and　friction　coefficient　of　contact　on　contact　bounce　has　been　analyzed　from　the　view　of　mechanical　dynamics.　The　3D　virtual　prototype　design　of　AC　contactor　provides　theoretical　basis　for　its　structure　optimization　design　and　has　high　practical　value.　©　2016,　The　editorial　office　of　Transaction　of　China　Electrotechnical　Society.　All　right　reserved.