  By means of the nuclear parton distributions which can be used to provide a
good explanation for the EMC effect in the whole x range, we investigate the
energy loss effect in nuclear Drell-Yan process. When the cross section of
lepton pair production is considered varying with the center-of-mass energy of
the nucleon-nucleon collision, we find that the nuclear Drell-Yan(DY) ratio is
suppressed due to the energy loss, which balances the overestimate of the DY
ratio only in consideration of the effect of nuclear parton distributions.
