The　wear　behavior　of　plasma　sprayed　Al2O3-13wt.%　TiO2　coating　against　WC　hard　alloy　has　been　investigated　within　a　load　range　of　10　to　100　N　and　a　sliding　speed　range　of　0.1　to　0.5　m/s　under　dry　sliding.　Through　careful　analysis　of　the　worn　surface　of　the　coating,　the　wear　mechanisms　transition　map　of　this　coating　has　been　established.　As　the　result,　the　main　wear　mechanism　of　the　coating　is　plastic　deformation　and　microploug　at　low　normal　load　and　low　sliding　speed,　that　is,　within　the　wear　rate　range　of　0.1　to　1.0　mg/m　of　the　coating.　At　intermediate　normal　load　and　intermediate　sliding　speed,　that　is,　within　the　wear　rate　range　of　1.0　to　3.0　mg/m　of　the　coating,　the　main　wear　mechanism　of　the　coating　is　microfracture　and　grain　spalling.　At　high　normal　load　and　high　sliding　speed,　that　is,　the　wear　rate　of　the　coating　is　greater　than　3.0　mg/m,　the　main　wear　mechanism　of　the　coating　is　fracture　and　delamination.