Abstract: Consolidation coefficients for soft soil calculated by settlement curves in indoor laboratory and in-situ test show that the consolidation coefficient for soft soil changes in preloading process, and decreases in general trend. The consolidation coefficient measured in laboratory is 6 - 9 times larger than that in in-situ test. Consolidation coefficient for remolded soil drops to 13% - 32% of the undisturbed soil. Reasons for the difference of the consolidation coefficient is analyzed.