Hamiltonian lattice QCD with Wilson fermions is investigated systematically
by strong-coupling expansion up to the second order. The effective Hamilto
nian is diagonalized by Bogoliubov transformation. The vacuum energy, chira
l condensate, pseudoscalar and vector meson masses are calculated. The comp
arison with the unitary transformation method by Luo and Chen is also made.
The method discussed in this paper has potential application to QCD at fin
ite density.