The effect of co-flow to jet velocity ratio on the mean flow characteristics of a turbulent compound wall jet over an inclined wall has been numerically investigated. Spread of the jet in cross stream direction along the wall decreases as the velocity of the co-flowing stream increases. It has been found that the bulk of the flow is self-similar for the range of velocity ratio studied. The present investigation suggests that the decay of the centreline velocity of the jet reduces as the velocity of the external stream increases. Keywords: Oblique wall jet, Co-flowing stream, Velocity ratio, Self-similarity, k-e model.