According to the recent advancements in quantitative study on soil structure, two sensitivities, of clay in conventional soil mechanics, stress sensitivity and strain sensitivity, are explicitly defined in this paper. Taking Xi＇an loess as the study subject, both undisturbed and reconstituted saturated samples from different depths are prepared for 1-D consolidation testing. Through the trial calculations, two sensitivities are obtained from the e-logP coordinates which are have relatively stable changing tendency. Contrasting with the stress sensitivity, the strain sensitivity has obvious advantages from the points of view of calculation and changing tendency.