  By globally analyzing nuclear Drell-Yan data including all incident energies,
the nuclear effects of nPDFs and initial-state parton energy loss are
investigated. Based on Landau-Pomeranchuk-Migdal (LPM) regime, the calculations
are carried out by means of the analytic parametrizations of quenching weights
derived from the Baier-Dokshitzer-Mueller-Peign$\acute{e}$-Schiff (BDMPS)
formalism and using the new EPPS16 nPDFs. It is found that the results are in
good agreement with the data and the role of the energy loss effect on the
suppression of Drell-Yan ratios is prominent, especially for low-mass Drell-Yan
measurements. The nuclear effects of nPDFs becomes more obvious with the
nuclear mass number A, the same as the energy loss effect. By global fit, the
transport coefficient extracted is $\hat{q}=0.26\pm0.04$ GeV$^{2}$/fm. In
addition, to avoid diminishing the QCD NLO correction on the data form of
Drell-Yan ratios, the separate calculations about the Compton differential
cross section ratios $R_{Fe(W)/C}(x_{F})$ at 120GeV are performed, which
provides a feasible way to better distinguish the gluon energy loss in Compton
scattering. It is found that the role of the initial-state gluon energy loss on
the suppression of Compton scattering rations is not very important and becomes
disappear with the increase of $x_{F}$.
