| As a center of regional economy, city has its soul in CBD. In each of stage of city's development, CBD always plays an important role of a core functional zone in the city where the most economic activities at the high level, especially the third sector gather in. It is also a place where the substance and energy to be highly concentrated and rapidly exchanged. For its advatages location, CBD can attract a large number of economic flows such as people, goods, capital, and information. CBD, There for, become the city's symbol of flourish and power for its highly intensive land-use. Following the economic globalization and rapid development of productivity, the quantity, quality, scale and strength of city has greatly improved since 1986. City, as a result, changes its appearance day after day. The scale of CBD and Sub-CBD develop so fast that the CBD system to be formed. For the important position of the CBD in city, the planning and construction of CBD system to be wide spreadly paid attention. Because of its vigor, CBD to be very well studied for a long time even though it has a research history of 80 years. An international conference of CBD in Beijing in 2002 shows that CBD research still has its important significance both to the world and China which can also testify the important theoritical and practical significance of my dissertation.Generally speaking, the cities in China have had a sector structure taking the industry as its key and a correspondent spatial structure under the planning system before 1978 when China took reform and open policy. After 1978, the economy in China has rapidly developed and the sector structure in city has greatly changed, which has deeply influenced the spatial structure in cities.The CBD planning in many cities to be successively enumerated in urban comprehensive planning because of its importance. So far, CBD planning and construction in more than 26 cities has been already placed on the agenda, and some of them have obtained a great achievement. Comparing with East China, planning economy system still take the leading place in West China. CBD has not played its core funtion in urban economy and has not driven the economic development of West China. Under the double opportunities of economic globalization and West China Development, the central cities have to face the problems of CBD renewing and Sub-CBD construction. With the combination of theory and practice, author attempts to lead the research work on CBD system of West China and probes the general laws and construction models of CBD in less development areas. If this dissertation can do something for the West China Development Strategy, it will be my happiness. That is the reason why 1 choose CBD as a subject of my dissertation.The dissertation be divided into two parts in almost same length. The first part is theoretical research which include 5 chapters. The second part is the case study with 2 chapters.As the academic background, the basic theories and relevant results are mainly listed and commented on in the first half of chapter one. In the second half, author introduces to a newconcept of flow economy which is used to explain the CBD's cause. Furthermore, a new dynamic mechanism stemming from physical geography and hydromechanics is put forward in the dissertation.Chapter two gives out a tendency idea to explain CBD's evolution which includes spatial movement and functional improvement. Author's main contribution in chapter 3 is construct a theoritical frame of CBD system which includes the cause, the mechanizm and pattern of CBD system. A new definition of CBD based on flow economy is also put forward in the chapter. In addition, the shape and functional intension of CBD is deeply discussed.The theory of Sub-CBD which includes the Sub-CBD definition based on flow economy, dynamic mechanizm of Sub-CBD cause and classification of Sub-CBD is perfectly and systematicaly studied in chapter four. Possibly, it will be the first one for me who gives sub-CBD a complete and systematical theo...
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