  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.
