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中文摘要：
城市化的进程越来越快，迫切需要运用新的科学手段和定量的研究方法来研究城市生态经济系统，为日益突出的人口、资源和环境问题的协调发展提供理论依据。本文以兰州市为例，采用能值分析理论，对兰州市1994—2004年的能值自给率、能值输出输入量比、能值投入率、环境负载率、能值-货币比、能值使用密度、可持续发展指数、人均能值用量、人口承载力、进行了计算和变化趋势分析，并与其它地区和国家进行比较。定量描述了兰州市生态经济格局和发展状况的总体特征，为进一步利用兰州本地资源，合理配置产业，实现可持续发展目标提供了策略和建议。
英文摘要：
The process of urbanization is faster and faster, so the new scientific means and quantitative research methods are needed to study the ecosystem urgently and offer some theoretical basis for resolving the increasingly prominent population, resources and environment problem. This research took Lanzhou as a case, using the theory of emergy analysis to calculate and analyze the trend of change of emergy self - sufficiency ratio, ratio of out- put - input, ratio of input, environmental loading ratio, emergy dollar ratio, emergy density, emergy based sustainability index, emergy per person, carrying capacity of population in Lanzhou from 1997 to 2004, then these indices were used to take comparisons between Lanzhou and other countries and regions. The ecological economic structure and the characters of development status were quantitatively describe, suggestions were put forward for making use of the resources, collocating industries in reason , realizing the sustainable development in Lanzhou City.
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