  In this paper, we study the Vlasov-Poisson-Fokker-Planck (VPFP) equation with
a small collision frequency $0 < \nu \ll 1$, exploring the interplay between
the regularity and size of perturbations in the context of the asymptotic
stability of the global Maxwellian. Our main result establishes the Landau
damping and enhanced dissipation phenomena under the condition that the
perturbation of the global Maxwellian falls within the Gevrey-$\frac{1}{s}$
class and obtain that the stability threshold for the Gevrey-$\frac{1}{s}$
class with $s>s_{\mathrm{k}}$ can not be larger than
$\gamma=\frac{1-3s_{\mathrm{k}}}{3-3s_{\mathrm{k}}}$ for $s_{\mathrm{k}}\in
[0,\frac{1}{3}]$. Moreover, we show that for Gevrey-$\frac{1}{s}$ with $s>3$,
and for $t\ll \nu^{\frac13}$, the solution to VPFP converges to the solution to
Vlasov-Poisson equation without collision.
