A series of dynamic triaxial tests of different relative densities and different consolidation stress ratios for the saturated fine gravel sands were done by using the TAJ - 20 vibration triaxial apparatus, the effects of the two factors on the dynamic strength of saturated fine gravel sands were studied. The results showed that, the effects of relative density on the dynamic strength of saturated with fine gravel sands I were relatively significant. With the increase of relative density, the dynamic strength of saturated fine gravel sand also increased, but the magnitude of the increase was not great. The effects of consolidation stress ratio on the saturated fine gravel sand dynamic strength was very significant. With the increase of the consolidation stress ratio, the dynamic strength of saturated fine gravel sand also increased, and the soil dynamic strength significantly increased when the consolidation stress ratio increased. Under the relative density or consolidation stress ratio, the dynamic strength and vibration time on semi-log coordinate showed a linear relationship.