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Ancient times, people perceive space and understanding of space, use the space to create space. The worldwide urban agglomeration, such as the high cost of land, urban population growth, the quality of the environment is deteriorating. Urgent need for an effective method to solve economic, social, environmental and other issues facing cities, to respond to this demand many design concepts, nothing less than the horizontal and vertical direction of the city's urban ground expansion. The floor space of the modern city is already crowded building, environmental pollution, ecological imbalance and traffic congestion portrayal of people living in the city to enjoy the modern material civilization, also suffered in the natural isolation, overcrowding, endless brought traffic irritability and restlessness psychological pressure, described as \In this context, to expand the urban underground space is the solution to our continuous expansion of the city's visionary, effective and necessary measures. One of the main goals of the underground space is to protect the natural, farmland conservation, and to provide shelter for the needs of defense and security guarantees, to withstand the harsh climate, comfortable indoor temperature to ease the high land prices, and ultimately improve the ground traditional urban aesthetic and social space. With the rapid socio-economic development of our country's major cities have a underground space development boom, the development and utilization of underground space have been expanding, the functional categories diverse development. Due to lack of underground space development in the vertical level planning, the irrational part of the facilities development exist contradictions of common space in the underground facilities, and seriously affected the normal underground space development. Scientifically and reasonably determine the stratification of urban underground space development model, the development of underground space in compliance with the principle of orderly, rational, helpful, not only to save construction investment, and can increase the effective utilization of underground space, should receive due attention . Future urban construction and development process of urban underground space and urban public space in a more extensive level fusion symbiotic work together to build the city's space system and improve the functions of the city, in this context, the paper from the urban underground space function the concept of levels of integration to be guided to specific examples, depth of research and design methods. Firstly, integration of the functional hierarchy of urban underground space research status, concepts, research methods and research background and significance made a brief exposition; followed by functional hierarchy of urban underground space and on the ground, underground space in the macro urban design level analyze the integrated development of motivation and the Evolution of research at the micro level, and then from the architectural design and proposed design should follow the basic principles; Finally cited correctness and practicality typical engineering examples to prove the theory. Inspired by their research for the creation of modern urban design, summarized and integrated strategy in the reality of urban construction practice has a certain value for references. The 19th century is the century of the 'bridge', the 20th century is the century of the 'high-rise buildings', scientists predict that the 21st century is the century of human development and utilization of underground space. \
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