  Numerous simulations indicate that a large number of subhalos should be
hosted by the Milky Way. The potential existence of a nearby subhalo could have
important implications for our understanding of dark matter (DM) annihilation.
In this study, we investigate the hypothetical presence of a nearby subhalo and
set the upper limits on the DM annihilation cross section by analyzing the
cosmic-ray antiproton spectrum. By presenting the ratios of annihilation cross
section limits for scenarios with and without a nearby subhalo, we can
quantitatively evaluate the potential impact of the nearby subhalo on the
limits of the DM annihilation cross section. The impacts of the concentration
model and the subhalo probability distribution have been considered. We explore
the antiproton contribution of the potential nearby DM subhalo accounting for
the DAMPE $e^\pm$ spectrum at $\sim 1.4$ TeV and find that the current AMS-02
antiproton results do not place the constraint on this contribution.
