  As a candidate bound for the Binary Black Hole (BBH) merger events detected
by LIGO/Virgo, Primordial Black Holes (PBHs) provide a useful tool to
investigate the primordial curvature perturbations on small scales. Using the
GWTC-1 to GWTC-3 catalogs, under the scenario that PBHs originate from large
primordial curvature perturbations on small scales during inflationary epoch,
we for the first time reconstruct the power spectrum of primordial curvature
perturbations on small scales. It is found that the value of the amplitude of
the primordial power spectrum is enhanced to $\mathcal{O}(10^{-2})$ on scales
$\mathcal{O}(1)$ pc. This may imply the validity of PBH as a possible BBH
merger candidate.
