Abstract: Based on the triaxial creep experiment of rock, the viscoelastic analytical solutions are obtained and aviscoelastic parameter identification method is proposed according to thethree-parameter H-K model. The viscoelastic parameter identification andback analysis are carried out by using the multi-stage loading creep curvesof granite and schist. The results of analysis show that the elasticparameters and viscoelastic parameters of the same sample change withdifferent step loading, in particular, there is a damage attenuation ofviscoelastic modulus and viscosity coefficient with loading. The obtainedanalytical curves using the back-analysis parameters agree with theexperimental creep curves very well.