城市能源供给、环境保护与经济发展之间有机统一是城市生态文明建设的重要课题，探究能源-经济-环境（3E）协同下典型能源输入型城市能源结构优化是该研究课题核心内容。本项目提出构建能源输入型城市能源生态系统设想，以生态学和系统学理论为依据，基于物质流方法分析能源输入型城市能源系统结构组成和运行机制，构建能源输入型城市能源生态系统；参照生物食物网络进行城市能源生态系统仿生建模，运用图论和拓扑分析方法对能源系统复杂网络进行网络流量分配和空间路径结构优化；基于模型优化结果和国内外城市能源结构转型的案例和经验，设计能源输入型城市能源结构优化路径并进行评估；最后选取北京市为实证研究对象构建北京市能源生态系统模型并进行优化，提出可行的北京市能源生态系统构建方案和能源结构优化路径，为城市生态文明建设和实现“绿色”发展提供参考。

It is of vital importance to coordinate economic development and environmental protection with energy supplies in the procedure of pursuing ecological civilization. As the key element, urban energy structure is in urgent need of economy-energy-environment(3E) cooperative optimization, especially for typical energy-input-oriented(EIO) cities. Therefore, the idea of constructing EIO cities’ energy ecosystem is attempted in this project. To make a clear description of structure and feedback of the system, the material flow analysis(MFA) method are employed in combination with ecology and system theories. Then a bionic model derived from food chains is constructed under the framework of natural ecological principles and methodologies. Meanwhile, graph theory methods and topological analysis are applied on this complex model so as to optimize its network traffic distribution and spatial structure. To reach an integrated conclusion on optimal paths for the transition of EIO cities’ energy structure, this bionic model is associated with domestic and foreign energy structure transition experiences thus to achieve both qualitative and quantitative reference value. Finally, this project conducts an empirical analysis and constructs the Beijing energy ecosystem, aiming to provide feasible suggestions and solutions under different scenarios, which is capable of enhancing the ecological civilization and sustainable development of EIO cities.