  We study the Littlest Higgs model with T-parity at the LHC through pair
productions of the T-odd top quark partner (T_-) which decays into the top
quark and the lightest T-odd particle. We identify the region of parameters
favored by the electroweak and cosmological considerations. The signal and
background events are simulated with fast detector simulation to study the
discovery potential at the LHC. We find that the hemisphere analysis recently
proposed by the CMS collaboration is very useful to separate the signal from
the t\bar{t} background. We discuss the observability of the top tagged signal
in the effective mass (M_{eff}) versus the transverse missing energy
(E_{Tmiss}) plane. We show that, for all our sample parameter sets with M_{T_-}
\leq 900 GeV, the excess of the signal over the background can be visible as a
bump structure in the E_{Tmiss} distribution for 50 fb^{-1} at relatively high
M_{eff} intervals.
