Adopting the equivalent linear visco-elastic constitutive relations of soils

one-dimensional（1D）analysis models of Quanzhou basin were established using equivalent linear method. Also

large-scale refined two-dimensional（2D）FE nonlinear analytical models were established for the sake of contrast

in which the modified Martin-Seed-Davidenkov viscous elastic-plastic constitutive relations were taken to simulate the dynamic characteristics of soils.Considering the inhomogeneity of ground soils and fluctuation of topography and bedrock surface

the seismic site effect was studied.Comparison between 1Dand 2Dmodels indicates that:1)the peak ground acceleration（PGA）magnification effects show a trend of decrease as the seismic intensity of input ground motion increases.The PGA magnification ratios of moderate earthquake to small earthquake and major earthquake to small earthquake are 0.83-0.99and 0.72-0.97respectively.2) The characteristics of seismic effect analyzed by the two methods are similar to each other when on the III sites.However

the 2Dnonlinear analytical models show a more obvious seismic amplification effect caused by fluctuation of bedrock surface and topography on the II sites.Also

there are significant differences in surface acceleration response spectrum and variations of PGA with depth by the two analytical methods.The acceleration response spectra of surface show a doublepeak or multi-peak phenomenon.Besides

the PGA displays a non-monotonic decreasing characteristic with depth and greater focusing effects of some particular soil layers by the 2Dmodels.