Shaking table tests for large models of an embankment on saturated sand layers are described. The tests were designed to discuss the dynamic stability by the circular arc analysis. The large models of the embankment on the saturated sand layer were placed in the shaking table box (8 m length, 4 m width and 2 m height). The failure of the embankment was confirmed to measure the rapid increase of residual settlements and lateral displacements with the increase of table accelerations. The excess pore pressure ratio was more than 0.5 at the time for settlements and lateral displacement of the embankment to start increasing. And the failure plane was estimated by the height difference of lateral white sand layers in the embankment. The calculated results of the circular arc analysis in consideration of the seismic coefficient and the excess pore pressure shows good agreement to the test results. Therefore it was concluded that the dynamic stability of the embankment on the saturated sand layers can be investigated by the circular arc analysis which considers the seismic coefficient and the excess pore pressures.