The effects of the consolidation ratios on the maximum dynamic shear modulus and the dynamic shear modulus versus the shear strain of sands are presented by using the resonant column method. The effects of the dynamic shear modulus versus the shear strain under different consolidation ratios on spectrum of surface ground motion are evaluated by the soil layer response calculation. The Fujian’s standard sand and Harbin’s sand of China are employed in the tests. The recommended formula considering the effects of the consolidation ratios on the maximum dynamic shear modulus of sands is given. The new formula indicates that the increasing degree of the maximum dynamic shear modulus due to kc>1 is significantly larger than that described by Hardin and Black’s formula. The effects of the consolidation ratios on dynamic shear modulus versus the shear strain and surface ground motion are demonstrated. The results indicate that the dynamic shear modulus versus the shear strain increases with increasing of the consolidation ratios; and the effects of the consolidation ratios on dynamic shear modulus versus the shear strain should be considered for the incidence of the strong shock.