Abstract: In order to study the dynamic properties of silty sand in a tailing pond and get the relative dynamic parameters, a series of laboratory tests about dynamic strength of silty sand were performed, and the normalized curve of the dynamic parameters with a very good regularity was obtained from resonant column tests and dynamic triaxial tests. Some important conclusions were obtained from the analysis of the deformation properties and strength properties. The influences of different consolidation ratios and consolidation pressures on the relationships between dynamic strength, pore water pressure and vibration times were analysed according to dynamic triaxial tests. It is found that the dynamic strength of the silty sand has a good exponential relationship with vibration times, which can be fitted by a power function. And the relationships between the dynamic pore water pressure ratio and vibration times can be fitted by an exponential function. The dynamic parameters of the silty sand was obtained to offer necessary parameters for the seismic design of engineering and relevent dynamic calculation. Meanwhile, the Hardin-Drnevich hyperbolic model and Davidenkov model were used to fit the dynamic shear modulus. The testing analysis results show that the fitting effects of two kinds of models are improved with the increase of the confining pressure, and the fitting effect of Davidenkov model is superior to Hardin Drnevich hyperbolic model under the same confining pressure. The research results can provide a reference value for the studies of dynamic characteristics of the silty sand.