  Saturation properties and liquid-gas phase transition of nucleus are analysed
in the framework of Hatree-Fock theory. We modify Hill-Wheller formula with a
finite-size-effect parameter by fitting the zero-temperature properties of
nucleus. Employing Gogny effective interaction and phenomenological expression
of Coulomb energy, we give the critical temperature of liquid-gas phase
transition of nucleus being about 12 MeV, which agrees with the result
extracted from heavy-ion collision experiments. It is pointed out that a
phenomenological formula of surface energy of hot nucleus is not avaliable in
the region where nucleon density is far away from the normal density.
