  As a next-generation complex extensive air shower array with a large field of
view, the large high altitude air shower observatory (LHAASO) is very sensitive
to the very high energy gamma-rays from $\sim$ 300 GeV to 1 PeV, and may thus
serve as an important probe for the heavy dark matter (DM) particles. In this
study, we make a forecast for the LHAASO sensitivities to the gamma-ray
signatures resulting from DM decay in dwarf spheroidal satellite galaxies
(dSphs) within the LHAASO field of view. Both individual and combined limits
for 19 dSphs incorporating the uncertainties of the DM density profile are
explored. Owing to the large effective area and strong capability of the
photon-proton discrimination, we find that LHASSSO is sensitive to the
signatures from decaying DM particles above $\mathcal{O}(1)$ TeV. The LHAASO
sensitivity to the DM decay lifetime reaches $\mathcal{O} (10^{26}) \sim
\mathcal{O} (10^{28})$ s for several decay channels at the DM mass scale from 1
TeV to 100 TeV.
