Since this national memorial hall has an extremely important　mission that commemorates the victims of atomic bomb in　Nagasaki during Second World War, celebrates eternal peace of　the world and promotes international exchange and　communication as well, the landscape in and around of the hall　has been required to show the presence of dignity. The site, that is　located in Nagasaki Peace Park, is needed to reserve substantial　number of parking space for car and tourist buses, and visual　relationship between several adjacent architectures had to be　adjusted. The landscape design tried to materialize those　conditions and constraints into visual environment appropriate to　express meaning of the space. Also, in the condition that the most of the architectural volume was buried underground due to the regulation of Urban Park Act, a circular shaped water basin of 40 meter in diameter is surrounded by a tall hedge of evergreen trees in order to generate the sense of a memorial space.