  We investigate the instanton effects on the heavy-quark potential,including
its spin-dependent part, based on the instanton liquid model. Starting with the
central potential derived from the instanton vacuum, we obtain the
spin-dependent part of the heavy-quark potential. We discuss the results of the
heavy-quark potential from the instanton vacuum. We finally solve the
nonrelativistic two-body problem, associating with the heavy-quark potential
from the instanton vacuum. The instanton effects on the quarkonia spectra are
marginal but are required for quantitative description of the spectra.
