Abstract：The widely accepted and relations are used for deducing the analytical equations of one-dimensional nonlinear consolidation coefficient of saturated clay，where the effective stress and void ratio are considered. The advanced GDS consolidation system，which can measure the bottom pore pressure during the consolidation process and where the following permeability test can be taken under the same consolidation pres- sure，is used to investigate the behavior of consolidation coefficient of Xiaoshan saturated clay. The compression index and permeability index can be obtained to calculate the nonlinear consolidation coefficient. Compared with the results from one-dimensional consolidation tests，the nonlinearity of consolidation coefficient is obtained.
