<p>In this study, the dynamic characteristics and microstructures of lacustrine soft clays were studied. Dynamic character tests were conducted on undisturbed, remolded, and saturated lacustrine soft clays, using a dynamic triaxial tester. A scanning electron microscope (SEM) was employed to assess the soil samples after dynamic testing. The results indicate that the dynamic characteristics of lacustrine soft clay were significantly affected by confining pressure and water content. A quantitative relationship was established among confining pressures, water content, and the dynamic shear modulus ratio. The dynamic characteristic parameters of undisturbed, remolded and saturated soil are obviously different, and the original structure can enhance the shear strength of soil. By comparing the results with those from other studies, we found that the dynamic characters of soft clays were considerably varied in different regions, and lacustrine soft clays had a larger dynamic shear modulus ratio and a smaller damping ratio when the dynamic shear strain was large. Using IPP software to process the microstructural images, we found that the soil was dominated by small pores and medium particles, and the roundness of pores and particles had an apparently positive correlation with the maximum diameter. Moreover, the pores and particles of the soil showed fractal characteristics and directionality, and the fractal dimensions and probability entropy were strongly correlated with the macrostructural parameters. Finally, we developed a prediction model for macrostructural and microstructural parameters.</p>