The author of this paper assumes that the viscosity of clay structure has no influence on the dissipation of pore pressure, then, proposes a simplified method of .settlement cal-culation, in which the primary and secondary compressions are calculated separately, and their summation is the total settlement at any time. The characteristics of this meth-od are simple, being able to obtain the ratio of primary to secondary compression at any time and taking into account of the effect of effective stress history...