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The purpose of this study is to propose a new urban design approach to meet changes in social and urban circumstances; democratization, urban design in existing built-up areas and the need for citizen participation in the process of urban development. The paper's significance lies in that it shows a new direction in urban design which has been made into a statutory plan(district unit plan).The proposed urban design technique for the improvement of existing commercial areas, specially retail streets have three advantages; firstly, it makes possible to make improvement and give administrative and financial support which is sensitive to the existing conditions of urban area for the better environment, secondly, it can maintain and improve the vitality of the existing retail street by taking into account it's potentiality, and thirdly, it can maximize the effect of improvement of the existing commercial district by linking it with other public projects that may be in operation or in preparation by other departments or offices. Thus, this research suggests how district unit plan as a newly organized urban design system can cope with the changing urban and architectural built-in environment.