Intelligent　AC　contactor　is　a　new　type　controlled　switch.　By　using　intelligent　control　system,　dynamic　control　of　intelligent　AC　contactor　can　be　made　in　the　overall　process　such　as　closing　course,　closed　course　and　breaking　course.　Overall　and　deepenning　ground　analysis　and　disscussion　on　intelligent　control　of　AC　contactor　during　closing　course　was　developed.　With　intelligent　control　system,　the　control　parameter,　such　as　switching-on　phase　angle,　strong　excitation　switching-on　and　switching-open　time　during　closing　course,　is　adjusted　according　to　different　power　voltage　(excitation　voltage).　Therefore,　the　speed　of　core　has　been　changed　during　closing　course,　the　core　striking　energy　has　been　reduced,　and　the　first,　second　bounce　of　the　main　contacts　during　closing　course　has　been　eliminated,　the　contacts　wear　has　been　reduced,　so　each　performance　indexes　is　improved.　With　a　great　number　of　experiments　and　dynamic　calculation,　satisfied　design　result　is　gotten　by　dynamic　optimal　design.