This paper examines role of Jutaku Eidan, Japan Housing Corporation and influence of low for management of farmland on company towns developed by Nippon Steel Co.Ltd. Hirohata Works. Nippon Steel began to build Hirohata Works in 1937. At the beginning, Hirohata Works developed its company housing by itself. Since 1941, Ministry of Agriculture and Forestry controlled farmland conversion by the Temporary Farmland Control Order. So Nippon Steel could not secure lands to build its company housing on. Therefore, Hirohata Works had to depend on Japan Housing Corporation for its company housing.

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 Post-War Reconstruction Urban Planning Project is unprecedented all over the world at the viewpoint of the scale and its planning technology and has given much impact to post-war urbanizing process in each city. But the detail and characteristics of its process at especially high economic growth period have been hardly clarified so far. Accordingly, the scope of this study is to clarify those characteristics from comparative investigation of 17 cities enforcing large-scale Post-War Reconstruction Project (PWRP) and to consider the relation between urbanized processes at high economic growth period and the first designation by area division system.
 This study is composed of six chapters and includes the analysis of urbanized processes at high economic growth period using multi variable analysis (3^rd chapter), the analysis of urban planning characteristics after area division and the consideration of relation with the former urbanized processes (4^th chapter), and case studies for typical cities (5^th chapter). Consequently, this study clarified the followings:
 1. While all target cities has similar condition as large-scale enforcement of PWRP, urbanized processes at high economic growth period are various and are divided into five groups. As for locational characteristics of land use zones extension, municipality consolidation and geographical condition are main factors for its area designation.
 2. The first designation processes by area division system also are various and are divided into five groups. As for locational characteristics of land use zoning extension, influences of municipality consolidation and geographical condition became stronger because the first designation of urbanized promotion area was enforced in the outside of the former period. Additionally, from inclusion of industrial areas, relation with densely inhabited districts (DIDs), and locations of land readjustment, urbanized process characteristics changed from those at high economic growth period.
 3. While new city planning law was established in 1968, old law has no system extending land use zones in line with population increase periodically. This system ‘population frame’ was established in new law. Therefore area scale of land use zones at high economic growth period was various in each city, but after area division, area scale differences of newly designated urbanized promotion area decreased. Population frame system had much impact to area scale of the first designation.
 4. Regarding on the relation between urbanized processes at high economic growth period and the first designation by area division, the transition ways are divided into four groups and seven patterns from the extending scale of land use zones and land readjustment. In addition, from those transition patterns, we can consider planning problems of each city. Especially in cities where land readjustment projects were less progressed from 1945 to 1975 consistently, sprawl areas widely might have been formed from outers of PWRP to the first designation area of urbanized promotion area. But in spite of the cities where land readjustment projects had been enforced continually with PWRP, all land use zones at 1975 and all DID (1970) weren’t covered by land readjustment. As for urbanized processes, the extension of land use zones with infrastructure improvement in parallel is common problem in Japanese cities.

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