  New pseudoscalars, axion-like particles (ALPs), provide the exciting target
for present and future collider-based experiments. Search for ALPs is performed
in this paper via the $W^{+}W^{-}$ fusion process
$e^{-}e^{+}\rightarrow\nu_{e}\overline{\nu_{e}}a\rightarrow\nu_{e}\overline{\nu_{e}}f\overline{f}$
at the $1$ TeV ILC corresponding to an integrated luminosity of $1$ ab$^{-1}$
and the beam polarization $P(e^{-}$, $e^{+}) = (-80\%$, $+20\%)$. Owing to the
good capability of the ILC in performing b-tagging and the sufficiently large
branching ratio of the ALP decaying into a pair of b quarks, the decay channel
$a\rightarrow{b\overline{b}}$ is mainly concerned. The prospective
sensitivities provided by the ILC on the ALP-fermion coupling as low as $1$
TeV$^{-1}$ and $1.75$ TeV$^{-1}$ are derived at $95\%$ confidence level in the
ALP mass intervals $37-50$ GeV and $52-300$ GeV, respectively. Our results will
help to probe significant parameter space in an unexplored region beyond the
existing constraints.
