A series of experimental researches on the deformation character were made of twenty undisturbed saturated samples of silty clay from a deep foundation pit in Wuhan at K0 consolidation and no drained shear test. The aim of the tests is to find the test curve of stress-strain and equation of elastic modulus in unloading of silty clay. The research results have shown that the curve of stress-strain in unloading is a hyperbola and is similar to the curve of triaxial compression test

but there is difference of a constant between them

and the equation of elastic modulus is different each other.