This paper firstly illustrates multiple regional concepts in Tokyo，and demonstrates the appropriateness to regard Tokyo metropolis as research object. Then，it reveals urban characteristics of Tokyo，according to global urban theory，to inspect the forming mechanism of Tokyo metropolis. By analyzing central functional site selection procedure of large enterprise，foreign-owned enterprise and large financing institution，this paper explores spatial structure change in Tokyo CBD. Meanwhile，the author illustrates industrial structure changes and meaning of evolving “circular metropolis plan” by analyzing agglomeration site selection of most characteristic finance and insurance department，real estate department，information communication department and high-end service department. Up to middle period of 20 century，urban plan and urban policy nearly remain in name only，but with zero economic growth and population decline，less nonlocal population flows into Tokyo，thus the effect of urban policy starts to be noticed. If Tokyo wants to get rid of traditional growth pattern，exquisite dominating pattern cannot be neglected. <<