  We evaluate $B\to K\pi$ decay amplitudes in perturbative QCD picture. It is
found that penguin contributions are dynamically enhanced by nearly 50%
compared to those assumed in the factorization approximation. It is also shown
that annihilation diagrams are not negligible, and give large strong phases.
Our results for branching ratios of $B\to K\pi$ decays for a representative
parameter set are consistent with data. We evaluate $B\to K\pi$ decay
amplitudes in perturbative QCD picture. It is found that penguin contributions
are dynamically enhanced by nearly 50% compared to those assumed in the
factorization approximation. It is also shown that annihilation diagrams are
not negligible, and give large strong phases. Our results for branching ratios
of $B\to K\pi$ decays for a representative parameter set are consistent with
data.
