  We examined Z\ell^+\ell^- and Zb\bar b couplings in the minimal
supersymmetric model (MSSM) with explicit R-parity violating interactions. We
found the top quark L-violating couplings \lambda'_{i3k} and B-violating
couplings \lambda''_{3j3} could give significant contributions through the top
quark loops. To accomadate the latest R_{\ell} data, \lambda'_{i3k} are suject
to stringent bounds, some of which can be much stronger than the current
bounds. Within the current perturbative unitarity bound of 1.25 for
\lambda''_{3j3}, the R_b value in R-violating MSSM agrees well with the
experimental data at $2\sigma$ level, but may lie outside the 1\sigma range
depending on the involved sfermion mass.
