On The Changing Process of Urban Spatial Structure and Improvement Problems of Central Cities in Hokkaido

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The aim of this research is to analyze the trend of urbanization and transformation of urban area in central cities in Hokkaido in post-high growth period. In addition, a study is made utilizing planning theory for Urban Land Use, and for Improvement System of provincial central cities.Some of the results obtained are follows;1.The characteristics of the changes that have occurred in the cities in Hokkaido whose compact and densely populated urban areas have been broken down, will be arranged by division into the following three stages: Quickening stage; Expanding stage; and Subsiding stage.2.In "built-up area", there are "population stable areas" which is in a stble state and "renewal-advancing areas". In "under-urbanized areas", there are two types of urbanizing processes; "the type filling-up their vacant spaces" and "the type renewing built-up spaces". So,it's necessary to establish the method of realizing a structual improvement system, such as "a method of creating movement" and "a method of riding on the movement", based on the scale of an area and a city, and the urban infrastructure and the movement of the whole urban space.3.Two different types of situations in stable areas are described:environments in good condition which should be maintaind and preserved, and the districts which need future public investment. The importance of making a plan for stabilizing the environment and establishing the method of improvement as well as intruducing the plan is emphasized.