  The effective Hamiltonian for the R-parity violating couplings induced
nonleptonic decay $B^-\to K^-K^0$ is calculated including leading log QCD
corrections running from $m_{\tilde q}$, the mass of the up-type squark, to
$m_b$. Experimental upper limit of this decay is used to give the bound on the
R-parity violating couplings $\lambda''$.
