To investigate the static and dynamic mechanics properties of undisturbed silty clay sampled from the subgrade of Changchun-Siping highway, the consolidation undrained triaxial test and resonant column test were carried out under different confine pressures. Test results show that the properties of undisturbed silty clay are relate to the pre-consolidation condition. With the increasing of confine pressure, the static strength and the maximum elastic modulus increase. The relationship between maximum dynamic shear modulus, reference shear strain amplitude and confine pressure display a linear formulation. The confine pressure plays a little influence on the maximum damping ratio and the fitting parameters of damping ratio. Based on these, Duncan-Chang model parameters, maximum dynamic shear modulus and reference shear strain amplitude with the confine pressure were quantified.