Low-voltage　switch　can　be　divided　into　contact　switch　and　non-contact　switch.　Non-contact　switch＇s　power　consumption　is　high　under　high　current　situation　and　it　has　no　visible　fracture　in　breaking　state.　Contact　switch　has　low　consumption,　strong　stability　and　it　has　visible　fracture　in　breaking　state.　Contact　switch　are　widely　used　in　industrial　control　and　power　networks.　This　paper　established　the　virtual　prototyping　model　of　a　220V,　50Hz　AC　contactor　and　analyze　the　influence　factor　of　moveable　contact　bounce.