A detailed stability analysis and a deformation analysis are necessary to planning of an important structure and to preventing from a ground disaster such as landslid or ground subsidence. The coefficient of earth pressure at rest K_0-value and coefficient of viscoelastic are required in order to analyse the problems. This paper is a study on experiments on K_0-value in over consolidated region and the coefficient of viscoelstic of saturated Shimajiri-Clay, Kin-Clay and Ariake-Clay.K_0-value in normally consolidated region is got easily, but K_0-value in over consolidated region is not. Then K_0-value in over consolidated region is got from ln p'-η curve. The linear relations between the parameter m and the plasticity index I_p is proved.Saturated clay has the time dependent characteristics of deformation. The coefficient of viscoelstic is got by generalized Voigt model.
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