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With the accelerated process of urbanization, the quality of the urban environment is an increasingly lower, since the concept of the urban forest also came into being. Changsha bathed in the spring breeze of reform and opening up, the rapid economic development, also facing the danger of Environmental Quality landslide, so to speed up the pace of construction of urban forest in Changsha, the protection of the smooth progress of the construction of urban forest, given fully to the economic development in Changsha oxygen is particularly important, prominent global environmental problems today. Changsha City's urban forest construction in the country in terms of it is excellent, but there are still more or less the problem or defect, in view of this, to investigate the the Changsha urban forest status quo and existing problems, sort out the urban forest construction overall ideas Changsha City's urban forest construction can be described as significant. Reconstruction, based on the impact factor of the forest ecosystem in Changsha, the natural conditions, the characteristics of plant resources, vegetation distribution status quo, and a series of relations Changsha City, Changsha urban forest ecosystem modeling system diagnostic model, the urban forest factor in the ecosystem affect the relationship between abstract to be a fuzzy matrix, divided its entire urban forest ecosystem subsystem, and system elements layered, which will simplify the complex system, principled, clarity, The final calculation of each element of the domain of influence and impact strength, after computer processing, you can show a causal relationship between the urban forest ecosystem reconstruction maps. In this way, people can clearly understand the entire city of Changsha, forest ecosystems, which can propose appropriate solutions for the existing problems, urban forest ecosystem building programs and development such as roads. This article is divided into three parts: The first part is a theoretical articles, Introduction to the concept of the urban forest, theory, and related functions, and domestic and international development status. The second part is a practical articles, Changsha city forest, using mathematical methods of the Changsha urban forest ecosystem modeling diagnosis, to sort out the problem of the relationship, find the main reason, secondary causes results. The findings show that in Changsha urban forest ecosystem, the most fundamental cause of the problem is the system to protect the investment power management level, decision-making, understanding and the basis of talent these five factors, five factors protection Changsha urban forest ecosystem will be stable. The third part is the guidance papers, the results obtained for the second part of the urban forest construction in Changsha rational suggestions and countermeasures.
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