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Utilizing the three-fireball picture within the quark combination model, westudy systematically the charged particle pseudorapidity distributions in bothAu+Au and Cu+Cu collision systems as a function of collision centrality andenergy, $\sqrt{s_{NN}}=$ 19.6, 62.4, 130 and 200 GeV, in full pseudorapidityrange. We find that: (i)the contribution from leading particles to$dN_{ch}/d\eta$ distributions increases with the decrease of the collisioncentrality and energy respectively; (ii)the number of the leading particles isalmost independent of the collision energy, but it does depend on the nucleonparticipants $N_{part}$; (iii)if Cu+Cu and Au+Au collisions at the samecollision energy are selected to have the same $N_{part}$, the resulting ofcharged particle $dN/d\eta$ distributions are nearly identical, both in themid-rapidity particle density and the width of the distribution. This is truefor both 62.4 GeV and 200 GeV data. (iv)the limiting fragmentation phenomenonis reproduced. (iiv) we predict the total multiplicity and pseudorapiditydistribution for the charged particles in Pb+Pb collisions at $\sqrt{s_{NN}}=5.5$ TeV. Finally, we give a qualitative analysis of the $N_{ch}/<N_{part}/2>$and $dN_{ch}/d\eta/<N_{part}/2>|_{\eta\approx0}$ as function of $\sqrt{s_{NN}}$and $N_{part}$ from RHIC to LHC.

Centrality, system size and energy dependences of charged-particle pseudo-rapidity distribution