Observation of the dynamic behavior of the embedded steel plate cellular bulkhead during earthquake have been performed at Nagoya Port since December，1985．In this study，seven major records are analized for the dynamic behavior of the embedded steel plate cellular bulkhead during earthquake．
　Following conclusions are obtained in this study．
1)According to the observasion ，it was found that the accelerasion of the top of the cell is larger than that on the seabed．First natural frequency estimated from the transfer function between the cell's top and the seabed is about 2Hz，and the predominant mode of cell is rocking.
2)The distributions of the front and back earth pressure during earthquakes are close to those of rocking mode of the cell.
3)The calculated result by earthquake response program BEADIII gives good agreement with measured result．Therefore，this calculation method is useful for evaluating the earthquake behavior of steel plate cellular bulkheads．
4)The distributions of the front and back earth pressure calculated by the present desigh standard give good agreement with measured result.