Abstract:An identification method of rheological model and associated parameters of rock based on laboratory creep experiments are presented. The method is established by using a mixed technique of pattern search and non-linear least-square regression,which can avoid regression divergence when initial rheological parameters are not optimally selected. The method is applied to investigate creeping tests of clay stone samples under uniaxial compression from an engineering projects,and the relevant rheoligical parameters of the samples using Burgers model are achieved. The results show that this model is preferable to the generalized Kelvin’s model.