The　contacts　of　contactor　are　connected　in　parallel　to　form　a　parallel　contactor　to　realize　capacity　expansion　operation,　because　the　contact　systems　are　independent　of　each　other,　it　is　difficult　to　guarantee　the　synchronicity　of　the　close　and　break　process　and　the　stability　of　the　holding　process.　Therefore,　this　paper　proposed　a　synchronous　control　strategy　based　on　single-pole　switch:　through　logical　processing　of　coil　control　signal　of　each　contactor,　the　independent　contact　system　of　each　single　pole　switch　was　controlled　by　correlation,　so　as　to　realize　the　synchronism　fixed-phase　closing　action　of　each　pole　contactor　and　zero-current　closing　action.　By　detecting　the　current　transfer　phenomenon　in　the　breaking　process　of　the　parallel　contactor,　the　breaking　sequence　and　breaking　time　were　identified　online,　and　the　breaking　sequence　was　dynamically　adjusted;　Following　the　change　of　breaking　time　of　contactor,　the　breaking　time　was　adaptively　adjusted　in　the　set　zero-current　breaking　region.　In　the　holding　process,　in　order　to　prevent　asynchronous　malfunction,　normal　and　abnormal　coil　current　control　modes　were　designed.　Took　the　working　condition　of　contact　as　the　feedback　adaptive　adjusting　coil　current　control　mode,　which　changes　the　single　energy-saving　operation　control　mode　in　which　the　coil　current　remains　unchanged　during　the　holding　process,　and　realize　adaptive　synchronous　stable　holding　of　parallel　contactors.　Related　experiments　verify　the　effectiveness　of　the　control　strategy.　©　2020　Chin.　Soc.　for　Elec.　Eng.