  Flavor asymmetry is investigated in polarized light-antiquark distributions
by a meson-cloud model. In particular, rho meson contributions to Delta u-bar -
Delta d-bar are calculated. We point out that the g_2 part of rho contributes
to the structure function g_1 of the proton in addition to the ordinary
longitudinally polarized distributions in rho. This kind of contribution
becomes important at medium x (>0.2) with small Q^2 (~1 GeV^2). Including
N->rho N and N->rho Delta splitting processes, we obtain the polarized rho
effects on the light-antiquark flavor asymmetry in the proton. The results show
Delta d-bar excess over Delta u-bar, which is very different from some
theoretical predictions. Our model could be tested by experiments in the near
future.
