The pseudorapidity distribution function of charged particles in nucleonnucleon collisions was presented. By using Glauber model, the mean numbers of participants, spectators in collision area, leading particles and binary nucleonnucleon collisions were calculated. The pseudorapidity distributions of charged particles in nucleusnucleus collisions are obtained. The theoretical results are consistent with those of the experimental observations in AuAu collisions at sNN=130 GeV made by the PHOBOS collaboration.