This　work　aims　at　studying　the　wear　properties　of　titanium　microalloying　Carbidic　Austempered　Ductile　Iron　(CADI)　and　the　refining　mechanism　of　TiC　on　M3C　carbides　by　theoretical　calculation　and　experimental　analysis.　The　wear　tests　were　carried　out　by　a　wet　rubber　wheel　wear　tester.　Computed　results　showed　that　TiC　particles　could　precipitate　previously　in　melt　to　refine　the　M3C　eutectic　carbides,　and　M3C　(010)/TiC　(011)　interface　is　stable.　Experimental　results　showed　that　TiC　particles　were　formed.　The　shape　of　M3C　eutectic　carbides　changed　from　net-like　to　strip-like　after　titanium　microalloying,　which　improved　the　wear　resistance　of　CADI.　For　CADI,　the　strip-like　or　dot-like　carbides　could　protect　the　matrix　more　effectively　than　net-like　due　to　the　decrease　of　exfoliation.