  The light-cone distribution amplitude (LCDA) of a heavy-light meson defined
in heavy quark effective theory (HQET), is a fundamental nonperturbative input
to account for innumerable $B$ meson exclusive decay and production processes.
On the other hand, the conventional heavy-flavored meson LCDA defined in QCD,
also ubiquitously enters the factorization formula for hard exclusive $B$
production processes. Inspired by the observation that these two LCDAs exhibit
the identical infrared behaviors, yet differ in the ultraviolet scale of order
$m_b$ or greater, we propose a novel factorization theorem for the heavy-light
mesons, that the LCDA defined in QCD can be further expressed as a convolution
between the LCDA in HQET and a perturbatively calculable coefficient function
thanks to asymptotic freedom. This refactorization program can be invoked to
fully disentangle the effects from three disparate scales $Q$, $m_b$ and
$\Lambda_{\rm QCD}$ for a hard exclusive $B$ production process, particularly
to facilitate the resummation of logarithms of type $\ln Q/m_b$ and $\ln
m_b/\Lambda_{\rm QCD}$ in a systematic fashion.
