  We discuss the possibility of finding polarized antiquark flavor asymmetry in
Drell-Yan processes. We find that the difference between polarized
proton-proton and proton-deuteron Drell-Yan cross sections should provide
valuable information on the polarized flavor asymmetry. Numerical results
indicate that the asymmetry effects are conspicuous especially in the large-x_F
region. Our analysis is important for the transversity distributions because
the flavor asymmetry cannot be found by inclusive lepton scattering and
W-production processes.
