In　this　paper,　a　software　method　for　measuring　the　static　characteristics　of　contactors　is　proposed　for　the　first　time,　considering　that　direct　measurement　for　these　characteristics　was　difficult.　First,　the　electromechanical　energy　conversion　relationship　of　contactors　is　summarized,　and　a　complete　process　which　utilized　the　static　flux　linkage　to　solve　for　the　magnetic　coenergy　and　the　electromagnetic　force　is　deduced.　The　theoretical　feasibility　of　this　calculation　method　is　verified　by　finite　element　simulation.　Second,　a　static-characteristics　measuring　device　adopting　＇movable　core　locking＇　and　＇current　closed-loop　control＇　is　developed　to　realize　software　measurement　of　static　flux　linkage　and　electromagnetic　force　characteristics.　Finally,　a　whole-process　displacement　estimator　is　constructed　based　on　the　measured　static-characteristics　data.　It　not　only　indirectly　verify　the　validity　of　the　static-characteristics　measurement　method,　but　also　realizes　displacement　estimation　for　the　contactor　in　the　whole　making,　closing　and　breaking　process　for　the　first　time.　This　paper　is　of　great　significance　to　the　simulation　and　high-performance　control　of　contactors.　©2023　Chin.Soc.for　Elec.Eng.