  In the paper, we show that the $B\to\pi$ transition form factor can be
calculated by using the different approach in the different $q^2$ regions and
they are consistent with each other in the whole physical region. For the
$B\to\pi$ transition form factor in the large recoil regions, one can apply the
PQCD approach, where the transverse momentum dependence for both the hard
scattering part and the non-perturbative wavefunction, the Sudakov effects and
the threshold effects are included to regulate the endpoint singularity and to
derive a more reliable PQCD result. Pionic twist-3 contributions are carefully
studied with a better endpoint behavior wavefunction for $\Psi_p$ and we find
that its contribution is less than the leading twist contribution. Both the two
wavefunctions $\Psi_B$ and $\bar\Psi_B$ of the B meson can give sizable
contributions to the $B\to\pi$ transition form factor and should be kept for a
better understanding of the B decays. The present obtained PQCD results can
match with both the QCD light-cone sum rule results and the extrapolated
lattice QCD results in the large recoil regions.
