  In the framework of the littlest Higgs model with $T$ parity, we study the
$W_H$-pair production at the CERN Large Hadron Collider up to the QCD
next-to-leading order (NLO). The kinematic distributions of final decay
products and the theoretical dependence of the cross section on the
factorization/renormalization scale are analyzed. We adopt the PROSPINO scheme
in the QCD NLO calculations to avoid double counting and keep the convergence
of the perturbative QCD description. Our numerical results show that the QCD
NLO corrections significantly reduce the scale uncertainty, and enhance the
leading order integrated cross section with a $K$-factor in the range of
$1.10-1.22$ ($1.09-1.17$) with the symmetry breaking scale $f$ varying from
$400 GeV$ ($400 GeV$) to $1.5 TeV$ ($1.0 TeV$) at the $14 TeV$ $(8 TeV)$ LHC.
We find that it is possible to select the signal events of the $W_H$-pair
production from the $pp\to W^+ W^- \to e^+ \mu^-\nu_{e}\bar{\nu}_{\mu}+X$
background with high ratio of signature over background by taking proper lower
limits on transverse momenta, invariant mass of the final charged leptons and
the missing transverse momentum.
