This article is concerned with the existence of traveling wave solutions for a discrete diffusive ratio-dependent predator-prey model.By applying Schauder's fixed point theorem with the help of suitable upper and lower solutions,we prove that there exists a positive constant c* such that when c > c*,the discrete diffusive predator-prey system admits an invasion traveling wave.The existence of an invasion traveling wave with c =c* is also established by a limiting argument and a delicate analysis of the boundary conditions.Finally,by the asymptotic spreading theory and the comparison principle,the non-existence of invasion traveling waves with speed c < c* is also proved.