The　wearing　state　of　the　elevator　brake　coil　influences　the　normal　work　of　the　elevator,　thus　is　vital　for　the　safety　maintenance　of　the　elevator.　This　paper　introduced　an　automatic　diagnostic　method　of　the　coil　wearing　state　through　measuring　the　acceleration　curve　of　the　running　coil.　By　applying　the　algorithm　in　the　real-time　inspecting　system,　the　hidden　danger　of　the　brake　system　can　be　discovered　in　time　and　thus　avoid　the　according　accidents.