Abstract：Combined with results of theory，shaking table test and numerical simulation，dynamical interaction and aseismic capability of soil-structure system are studied and analyzed based on analysis of theory and calculation. The question of ruined earth pressure cell in test is solved，and the contact pressure between soil and pile is found out by the numerical simulation and distributing law of earth pressure. It is explained and sure that branches and disks of the pile are main components of foundation which can reduce shake and bear dynamic load，so they lighten the impact of seismic waves to structure and consume structural seismic energy fed back to foundation. Phenomena of pulling up on one side and pressing down on the other side in the pile foundation are revealed according to reverse relation of time-history curve of earth pressure from the corresponding measuring points on the sides of the pile foundation under seismic action at the same time. The phenomena are produced because of dynamic interaction of structure-pile-soil，which results in that bearing table shows turn effect. This law not only explains essential reason that the buildings are inclined and toppled in the seismic region，but also illuminates and verifies that the aseismic capability of structure plays greatly in the dynamic interaction system.
