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We calculate the amplitudes of $b\to s$ transition in extension of theStandard Model with $Wtb$ anomalous couplings. We found that i) there exist theWard identity violating terms in effective vertix of $b\to s\gamma$. The terms,which come from the tensor parts of $Wtb$ anomalies, and can be canceledexactly by introducing corresponding $Wtb\gamma$ interactions, ii) $Br(B_{s}\to \mu^{+}\mu^{-})$ provides unique information on $\delta v_L$ which is setto zero in top decay experiments, and stringent bounds on $v_R,\ g_L$ by$Br(B\to X_s\gamma)$ are obtained.

Constraints on $Wtb$ anomalous coupling with $ B\to X_{s}\gamma $ and $B_{s}\to\mu^{+}\mu^{-}