  We present a short review on the properties of heavy and light mesons'
light-cone wavefunctions (LCWFs), and their distribution amplitudes (DAs). The
B meson LCWFs can be treated by taking the heavy quark limit ($m_b\to\infty$)
and by using the heavy quark effective theory. Furthermore, we propose a simple
model for the B meson WFs with 3-particle Fock states' contributions, whose
behaviors are controlled by two parameters $\bar\Lambda$ and $\delta$. Using
such model, the form factors $F^{B\to\pi}_{+,0,T}$ and $F^{B\to K}_{+,0,T}$ in
large recoil region are studied up to ${\cal O}(1/m_b^2)$ within the $k_T$
factorization approach. On the other hand, we adopt Brodsky-Huang-Lepage (BHL)
prescription for constructing the WFs of the lighter pseudoscalars as $\eta_c$,
D-meson, pion, kaon, $\eta^{(\prime)}$ and etc. Such BHL-like model can be
conveniently extended to construct the LCWFs for light scalar or vector mesons.
Within such model the longitudinal distributions of those WFs are basically
determined by a parameter $B$, whose value can be determined via a global fit
of experimental data.
