Abstract: Soil-substructure dynamic interaction was studied by large-sized shaking table test. A square pipe made of accentual emulsion was chosen as a substructure model and was buried in sand inside a large-sized rigid container, installed on the shaking table. The model was snaked with simple harmonic wave in the direction perpendicular to the substructure axis. The dynamic stresses in substructure and dynamic earth pressures and accelerations on interface between sand and substructure were measured. Based upon the test results a calculation modeling the soil-substructure dynamic interaction was carried out. The dynamic analysis of this small substructure system was made by FEM with quadrilateral isoparametric elements. The results obtained indicated that when static and dynamic nonlinear behaviors are taken into account and thin-layer elements are used in the interface between two media, the calculated results are in fairly good agreement with test results.