Abstract: Attempts were made to find a quantitative method for determining the rheological parameters of wood in order to have a better understanding of the rheological behaviour of wood chips in compression perpendicular to grain.The deformation of wood in compression perpendicular to grain over the rheological range is quite complicated.In the rheological range,the instantaneous deformation consists mainly of elastic deformation and plastic deformation.In most cases,the creep is an overlap of viscoelastic function and time-dependent plastic deformation.However,the overlaped rheological parameters can be separated by a simple method.Five kinds of creep-recovery curves were found in the wide range of constant stresses due to the overlap of various rheological parameters and functions.