The historical materials regarding the post-war reconstruction of Oita city are collected in this paper. For the deeper understanding of the post-war reconstruction of Oita city, comparison analysis of the city planning of Oita city between pre-war and post-war is needed. At the same time, the remaining topics to be investigated about are as follows; (1) the parks built on the post-war reconstruction; (2) the housing reconstruction in Oita city after the war; and (3) the planners involved in the post-war reconstruction of Oita city.

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The authors have been studying on a diatomaceous earth-based improving material. The material immediately improves soft soil to good quality soil which can be transported. The improving material is a material with a low environmental impact because it improves the strength without significantly changing the physical and chemical characteristics of the soil. Field test was conducted on sedimental ground with cohesive soil. The ground was improved by a shallow soil stabilization using the improving material. The embankment was constructed by the improved soil. The degrees of compaction and the cone index of the embankment were satisfied the target values.

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