The　microstructure,　mechanical　properties　and　wear　resistance　of　carbidic　austempered　ductile　iron　(CADI)　obtained　at　different　austenitizing　temperatures　were　investigated.　The　dry　sliding　wear　failure　mechanism　in　block-on-ring　tester　and　erosive　wear　failure　mechanism　of　CADI　in　the　slurry　of　pH　=　4,　pH　=　10　were　analyzed.　The　results　show　that　with　the　increase　of　austenitizing　temperature,　the　hardness　and　tensile　strength　of　CADI　first　increase　and　then　decrease,　and　the　wear　loss　decreases　first　and　then　increases.　The　shedding　of　carbides　in　corrosive　media　and　the　deformation　of　the　matrix　around　the　graphite　nodules　are　the　main　failure　mechanisms　in　corrosive　wear.　In　addition,　abrasive　wear　and　adhesive　wear　are　the　main　failure　mechanism　under　dry　sliding　wear　condition.