AC　contactor　with　the　rated　current　of　12A　is　to　be　the　research　object　in　this　paper.　The　simulation　module　of　electromagnetic　mechanism　of　AC　contactor　with　dynamic　characteristic　calculation　and　analysis　is　designed　by　experiment　and　simulation　research,　so　the　best　and　worst　closing　phase　angle　is　determined,　and　the　foundation　of　speeding　up　electrical　life　experiment　is　laid.　The　phase　angle　selection　device　is　made　and　the　control　program　based　on　the　software　of　LabVIEW　is　programmed,　as　a　result,　it　has　the　function　of　automated　acquisition,　data　classification　of　the　waveform,　alarm　and　so　on.　The　test　method　of　electrical　life　with　fixed　angle　is　adopted,　the　electrical　life　experiment　and　data　acquisition　of　120,000　times　is　accomplished　by　life　test　system.　The　data　processing　module　is　established,　which　can　read　the　characteristic　parameters　about　electrical　life,　so　the　efficiency　of　life　test　is　improved.　By　analyzing　the　trend　of　arcing　time,　no-load　make　duration　of　contact　with　the　increasing　of　electrical　life　times,　the　prediction　model　of　electrical　life　of　AC　contactor　is　established　according　to　the　prediction　method　of　time-series.