  Using the low energy effective Hamiltonian with the generalized
factorization, we calculate the new physics contributions to $B \to \pi^+
\pi^-, K \pi$ and $K \etap$ in the Topcolor-assisted-Technicolor(TC2) model,
and compare the results with the available data. By using $F_0^{{\rm
B\pi}}(0)=0.20\pm 0.04$ preferred by the CLEO data of $B \to \pi^+ \pi^-$
decay, we find that the new physics enhancements to $B \to K \etap$ decays are
significant in size, $\sim 50%$ with respect to the standard model predictions,
insensitive to the variations of input parameters and hence provide a simple
and plausible new physics interpretation for the observed unexpectedly large
$B\to K \etap$ decay rates.
