  In this paper, we calculated the branching ratios and direct CP violation of
the four $B\to K\pi$ decays with the inclusion of all currently known
next-to-leading order (NLO) contributions by employing the perturbative QCD
(pQCD) factorization approach. We found that (a) Besides the 10% enhancement
from the NLO vertex corrections, the quark-loops and magnetic penguins, the NLO
contributions to the form factors can provide an additional $\sim 15%$
enhancement to the branching ratios, and lead to a very good agreement with the
data; (b) The NLO pQCD predictions are $\acp^{dir}(B^0\to K^+\pi^-)=(-6.5\pm
3.1)%$ and $\acp^{dir}(B^+\to K^+ \pi^0)=(2.2\pm 2.0)%$, become well consistent
with the data due to the inclusion of the NLO contributions.
