This paper examines the treatment of Genbaku-Dome and its site (Saiku-cho and Sarugaku-cho) in the Hiroshima Urban Reconstruction Plan and the Hiroshima Peace City Plan. The site of the Genbaku-Dome, initially included in Chuo Park (Motomachi), became a part of Hiroshima Peace Memorial Park with Nakajima Park (Nakajima-honcho) at the time of Hiroshima Peace Memorial Park and Peace Memorial Hall Competition. This paper also examines competition guidelines and competition plans, and evaluates Kenzo Tange and his colleague's plan and others' plan.