The seismic response analysis of site is an important guarantee for the smooth implementation and long-term safe operation of many offshore projects, and it is very important to study the small strain dynamic properties of seabed soil. In this paper, the small-strain dynamic properties of offshore seabed soil in the Liaodong Bay were tested and analyzed by using the in-situ borehole sampling and indoor resonant column instrument. The applicability of the existing empirical formula for predicting the initial shear modulus G_max of seabed soil was discussed. The test results in this study were compared with the existing shear wave velocity test results of seabed soil in the surrounding sea area. The attenuation characteristics of dynamic shear modulus and the development trend of damping ratio of the seabed soil in small strain range were analyzed, and a quantitative simulation was carried out to evaluate the normalization characteristics of dynamic shear modulus' attenuation curve of seabed soil. The results showed that the shear wave velocity of undisturbed seabed soil obtained by resonance column test is in good agreement with the existing test results in the surrounding sea area. Compared with land soil, the normalized G/G_max of marine soil decays more slowly and the damping ratio increases more slowly in the small strain range. By introducing the critical shear strain, the attenuation curves of small strain dynamic shear modulus of seabed soil corresponding to different soils and different buried depths can be normalized. These research findings can provide some guidance in reasonably evaluating the site response of offshore projects.