-A truncated shell model approach is presented for studying the properties oflow-lying states as well as the high-spin states in even-even nuclei with the help of thegeneralized boson-fermion expansion technique.The primary fermion state space isspanned by the interacting valence protons and neutrons with effective nucleon-nucleonforce.The truncated model space is considered as a direct sum of two subspaces corre-sponding to the configurations of(sd)~N and(sd)~(N-1),respectively,plus a broken fermionpair.Numerical calculations are carried out for ~(130～134)Ce isotopes.The calculated spec-trum reproduces the experimental data quite well,especially the backbending appearingin these nuclei.The results suggest that the approach is able to describe the spectroscopyof states with angular momenta up to J≈20. -A truncated shell model approach is presented for studying the properties of low-lying states as well as the high-spin states in even-even nuclei with the help of thegeneralized boson-fermion expansion technique. The primary fermion state space isspanned by the interacting valence protons and neutrons with effective nucleon-nucleon force.The truncated model space is considered as a direct sum of two subspaces corre-sponding to the configurations of (sd) ~ N and (sd) ~ (N-1), respectively, plus a broken The calculated spec-trum reproduces the experimental data quite well, especially the backbending appearing in these nuclei. The results suggest that the approach is able to describe the spectroscopy of states with angular momenta up to J≈20.