The lepton angular distributions of the Drell-Yan process in
the fixed-target experiments are investigated by NLO and NNLO
perturbative QCD. We present the calculated angular parameters
$\lambda$, $\mu$, $\nu$ and the degree of violation of the Lam-Tung
relation, $1-\lambda-2\nu$, for the E615 experiment as well as
predictions for the COMPASS experiment. Many salient features of
transverse momentum and rapidity dependence could be qualitatively
understood by a geometric approach.