It had been determined recently to build National Memorial Hall in Hiroshima for the Atomic Bomb Deceased in Hiroshima Peace Memorial Park, and we could excavate the stratum of Peace Park before foundation works. This paper aims to examine the urban structure of Peace Memorial Park from view-point of stratum excavated. The main results are as follows: 1) It is very useful for excavating the stratum to examine where and what the present some point is in the past by overlapping selected who-period map within the past several period maps. 2) By excavating the stratum which had been seldom churned, we caught the overlap structure which showed atomic-bombed stratum, pre-war stratum and living stratum in Edo Era. Then, those stratum presents the clear urban structure.
