Dynamic properties of Red river dyke sand such as vertical Young’s modulus and damping ratios were experimentally investigated by using cylindrical specimens (diameter Di = 5cm, and height H = 10 cm). The specimens were taken from the boreholes at the foundation of the Red river’s right dyke with different depths (K73+500-K74+100). At some stable stress states, vertical Young’s modulus was measured with the non- contact transducer, by applying a series of unload-reload cycles with vertical strain single amplitudes varying in the range of 0.001% to 0.1%, at different confining stresses. Test results show that the degradation of the vertical Young’s modulus and the increase of damping ratio on the single vertical strain amplitude were observed and could be well simulated by empirical equations.