A series of the investigations have been conducted for the earthquake-proof　design of soil embankments which are actually levees. In this paper, the experimental results with full-scale models were compared to the stability analysis with the　circular arc method.
　Generally speaking the similarity is hardly satisfied between prototype soil　structures and small scale models. Also when the experiments are conducted in the field with the prototype structure, it can not be tested for destruction. The　experiments reported herein were carried out with full-scale models under large magnitude of excitation and it is believed that the experiment reproduced very aculately the behaviour of the proto structure under strong earthquake　condition.
　From the experiments many useful data for the earthquake-proof design of the structures were obtained.
　The circular arc analysis in which the seismic coefficients are distributed in height seems rational because the response of the embankment can not be ignored in the frequency range of earthquakes.
　Furthermore the vibration table of new type used in this experiment is described in the appendix.