The　effect　of　austenitizing　process　of　carbidic　austempered　ductile　iron　(CADI)　on　the　microstructure,　mechanical　properties　and　abrasion　resistance　was　studied.　The　results　indicate　that　with　the　increase　of　austenitizing　temperature　acicular　ferrite　and　high　carbon　austenite　become　thicker　and　bigger　gradually,　and　the　amount　of　high　carbon　austenite　and　its　carbon　content　increase.　CADI　contains　a　large　amount　of　proeutectoid　ferrite　when　850　degrees　C　austenitizing　temperature,　which　greatly　reduces　the　hardness　and　abrasion　resistance.　With　the　rise　of　austenitizing　temperature,　the　proeutectoid　ferrite　disappears　and　carbides　partially　dissolve　into　the　matrix　gradually.　The　hardness　first　increases　and　then　reduces,　while　the　effect　of　austenitizing　time　is　very　little.　During　the　wear　test,　specimens　with　low　hardness　exhibit　a　huge　plastic　deformation　but　little　wear　debris,　besides,　feathery　ausferrite　can　protect　graphite　from　being　pulled　out.　More　carbon　amount　makes　austenite　stable　enough　to　avoid　brittle　damage　due　to　the　appearance　of　martensite.