Abstract: This paper explored the existence of periodic solutions with strictly positive components and impulses of a nonautonomous ratio-dependent predator-prey system. Sufficient criteria were obtained for the existence of strictly positive periodic solutions. The approach was based on a continuation theorem in the coincidence degree theory as well as some prior estimates.

Key words: ratio-dependent, positive periodic solution, impulse, coincidence degree, non-autonomous, ratio-dependent, positive periodic solution, impulse, coincidence degree