  We use the constraints on the diffusion parameters as obtained with stable
nuclei to calculate the cosmic antiproton flux from annihilating relic
neutralinos. We discuss the relevance of each characteristic parameter,
describing our two dimension diffusion model, on the flux of antiprotons
produced in the dark halo of our Galaxy. We estimate a two orders of magnitude
uncertainty on the flux due to the unknowledge of the propagation parameters. A
conservative and systematic evaluation of the flux in the supersymmetric
parameter space is done in order to exclude configurations providing a total
(secondary plus primary) flux in excess with observations. We also study the
effect on the flux induced by modifications in the distribution of cold dark
matter in the Galaxy.
