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We introduce an anomalous top quark coupling (right-handed current) intoStandard Model Lagrangian. Based on this, a more complete calculation of $b \tos\gamma $ decay including leading log QCD corrections from $m_{top}$ to $M_W$in addition to corrections from $M_{W}$ to $m_b$ is given. The inclusive decayrate is found to be suppressed comparing with the case without QCD running from$m_t$ to $M_W$ except at the time of small values of $|f_R^{tb}|$. e.g. when$f_R^{tb}=-0.08$, it is only $1/10$ of the value given before. As $|f_R^{tb}|$goes smaller, this contribution is an enhancement like standard model case.  From the newly experiment of CLEO Collaboration, strict restrictions toparameters of this top-bottom quark coupling are found.Comment: 20 Pages, 2 figures( ps file uuencoded)

b→sγ decay and right-handed top-bottom charged current