In this paper a Holling-Tanner prey-predator model is considered in the form
where and respectively represent the species densities of the prey and predator. is the outward unit normal vector on the smooth boundary and . The constants are the diffusion coefficients corresponding to and respectively, and all the parameters appearing in (1) are assumed to be positive. The authors obtain some results for the global stability of the unique positive equilibrium of this model, and thus improve some previous results.