Digital　Signal　Controller　dsPIC　is　introduced　into　intelligent　AC　contactors　in　this　paper.　There　are　Digital　PI　and　on/off　control　presented　in　detail,　which　adjusted　coil　current　in　real-time　to　make　the　dynamic　attraction　and　counterforce　of　contactor　fit　well　in　making.　So　that　the　bounce　time　of　contact　reduced　greatly　and　the　lifetime　of　AC　contactors　prolonged.　During　holding,　coil　current　kept　in　a　low　value　to　save　energy.　In　addition,　coil　current　can　be　monitored,　which　realized　the　protection　of　over-current　by　High-Speed　Analog　Comparator,　integrated　in　dsPIC.　It　has　the　characteristics　of　fast-response,　high-accuracy　and　flexibility.　In　conclusion,　the　digital　control　module　has　many　advantages　such　as　compactness,　simple　hardware,　fast　response　and　cheapness,　it　is　suitable　for　working　on　a　much　wider　range　of　AC　or　DC　voltage　and　adapt　to　different　objects　by　programming　slightly　rather　than　changing　hardware.　Meanwhile,　The　performance　of　digital　intelligent　AC　contactors　is　affected　little　by　parameters　varying,　environment　changing　or　devices＇　burn-in.