The variation curves and rules of dynamic shear modulus and damping ratio for clay with sand within the shear strain range of 10-6 up to 10-4 are obtained by the resonant column test.The influence of the confining pressure on dynamic shear modulus,damping ratio and the maximum dynamic shear modulus is discussed.The variation rules of the maximum dynamic shear modulus and maximum damping ratio with the gravel content are analyzed.The results show that within the small shear strain (10-6～10-4),the dynamic shear modulus G falls as the augmentation of shear strain γ,and rises with the enhancement of the confining pressure；The damping ratio increases along with the accretion of the shear strain γ；With the increase of gravel content,the maximum dynamic shear modulus enhances,but the maximum damping ratio decreases.The results may serve as reference for similar projects.