The　operating　characteristics　test　system　of　AC/DC　contactor　is　introduced　in　this　paper.　It　achieved　phase　selection　in　the　making　and　breaking　course　of　contactor　by　taking　PIC16F887　as　the　core　of　control　in　hardware　part.　The　voltage,　current　of　coil　and　main　circuit　with　three-phase　contacts　were　obtained.　With　Keyence　laser　displacement　sensor　used,　displacement　of　contact　and　iron　core　changing　over　time　were　achieved.　Moreover,　the　sound　signal　making　in　the　making　course　of　contactor　by　electret　microphone　was　captured?All　signals　mentioned　above　was　transmitted　to　PC　based　on　12-bit　data-acquisition　with　high　accuracy　and　highspeed.　Software　part　of　system　achieved　intelligent　data　processing　containing　signal　de-noising　by　wavelet,　the　spectrum　analysis　and　extraction　and　localization　of　signal.　With　these　means,　it　realized　the　measurement　of　parameters　such　as　contact　gap,　over-travel,　the　arcing　energy　automatically.The　test　system　can　provide　technical　support　for　contactor　studying　and　simulation,　control　strategy　verifying　of　AC/DC　contactor.　It　is　of　theoretical　and　practical　significance　in　the　design　and　development　of　AC/DC　contactor.