This project is about the work of the architect- koichi SATO on the Hiroshima Red-Cross Branch Hospital. As refer to the way of its reform and the characteristic of its design, we could explore koichi SATO's activities in Hiroshima. As a conclusion : l)The construction of the Hiroshima Red-Cross Branch Hospital was generally meant for the war's purposes. 2)During the assignment of the work from Showa 8/3/7 to 14/2, koichi SATO's activities not only involved in designing the Red-Cross Branch Hospital, as well as other buildings in Hiroshima. 3)Besides, as refer to the characteristic of its design on the branch hospital, we could exolore the beauty of its classical design as well as a profound impression. Although the primary's plan was meant for the war's purpose. The exterior which is made of the terra-cotta ; the co lour it used and the soecial design for the layout, has admitted by the public.