  In the framework of Color Glass Condensate, the pseudo-rapidity distributions
of charged hadrons in pp and pA collisions at the LHC are studied with the UGD
function from the GBW model. With a $\chi^{2}$ analysis of the CMS data in pp
collisions at $\sqrt{s}=0.9,~2.36,~7$ TeV, the normalization factor is obtained
and the theoretical results are in good agreement with the perimental data.
Then, considering the influence of nucleon hard partons distribution on the
number of participants in pA collisions by a Glauber Monte Carlo method, we
give the predictive results for the multiplicity distributions in p+Pb
collisions at $\sqrt{s}=4.4$ TeV.
