The purpose of this paper is, by taking Suginami ward as a sample, to examine and analyze the actual state of the land use of the strip zoning system as the firebreak belt and its optimal location and allocation. Metropolitan's proof living zone plan divides 23 wards area (of Tokyo) into 700 units with roads rails rivers, and so on. This study shows the following, an improvement degree of the disaster prevention barrier and the block scale make some areas dongerous. It's the most important problem in order to further disaster prevention town planning.
