The Japanese Institute of Landscape Architecture begins the concrete action of aiming at the conservation of modern landscape heritage. The Agency for Cultural Affairs is also proceeding to protect the gardens and the parks of the modern age. Most of the existing gardens in Tokyo are the feudal lord's gardens of the Edo period and a few modern gardens which were constructed during and after the period of the Meiji era and still are remain the same shape they were originally. However, the main portion of the Aiison-so garden which was constructed by Eiichi Shibusawa (1840-1931) still exhibits the same organizational structure. It is a remaining case considered to be very precious within the modern gardens of Tokyo. Therefore, we considered the composition design of the Aiison-so garden restoring it according to the material of the visitor's records, and defined that while the Aiison-so garden was destroyed by air raids in 1945 to Eiichi who settled down in the Aiison-so in 1901 to assume basic materials for maintenance. The present study shows that Aiisonsou garden is a typical of garden that had most of the element of a modern garden.