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By employing the Glauber model,we give the centrality dependences of the numbers of participants and binary nucleon-nucleon collisions in nucleus-nucleus collisions.By taking into account the energy loss of the participants in their multiple collisions,we then present the pseudorapidity distributions of charged particles in nucleus-nucleus collisions as a function of beam energy and impact parameter.Finally,we analyze the centrality dependence of the pseudorapidity of the charged particles in Au+Au collisions at energies from √SNN=19.6 to 200 GeV.The theoretical results are in good agreement with the experimental observations of the RHIC-PHOBOS collaboration.