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The purpose of this study is to clear the process of urbanization in Tsukuba New Town from the data of our long − term surveys and to appear the relationship of the factors that described from the three sides of urbanlzation ． We conclude ： 1 ） There are three types of the changing pattern of urbanization descfibed by the factors ． 2）As Ihe phenomenen of urbanization there are three tuming points ． 3 ） Although the fomler two 田 ming points are influenced by govemmental and social phenomenon ， lhe latter results from inside factors ， in which the period of matUrity can be divided from the phase of new town ．

The purposes here are to conclude our researches about urbanizing process of privately owned land in readjusted area of Tsukuba New Town for these 22 years ， and to consider the contributing factors of this trend，The movement of the urbanization there has been quite stable ． They may be divided into three stages： 1）The first is stable urbanizing process before EXPO 嚠 85；2）℃he second is rapidurbanization in the period of EXPO ' 85 and stagnation after that；3）The third is ascending period with the actualization of urban potential after 1990．The growth and the completion of the city center was the main factor of thesie trends． EXPO ' 85 contributed to the maturity of the city center ， and facilitated the urbanizing process later on ．