Abstract: Orthogonal test were conducted to explore the influence of plasma spraying parameters on wear behaviours of Cr2O3 coatings.The wear track were examined by scanning electron microsopy (SEM) and energy dispersive spectroscopy (EDS).The results show that the order of parameters affecting the wear property from major to minor is spray distance L,hydrogen flow GH2,plasma current I1 and argon gas flow GAr.The optimized parameters are plasma current 650 A,Ar gas flow 40 L·min-1,H2 gas flow 10 L·min-1 and spray distance 100 mm.It was found that wear mechanism of Cr2O3 coatings was governed by micro brittle fracture and adhesion wear.