本研究围绕国家推进新型城镇化的重大战略需求，分析总结过去十年中国主要地级城市空间增长规模、用地类型及强度的变化规律，研究快速城镇化背景下城市水环境基础设施规模、结构和布局的演变特征，识别不同城市空间增长模式对于水环境基础设施的关键影响；综合运用复杂系统建模理论和方法，分别研发基于土地利用变化的城市空间增长动态模拟模型、基于多目标优化的水环境基础设施规划模型，集成开发基于地块尺度的城市空间增长-水环境基础设施综合模拟系统；将该系统应用于若干典型城市，定量模拟案例城市未来十年空间增长速度和用地强度情景下水环境基础设施结构和布局的变化响应，评估和比较不同水环境基础设施规划方案的投资费用、环境效益、系统弹性等特征；以提高水环境基础设施可持续性为目标，从规模理性增长、空间合理利用、用地集约高效等方面提出城市空间增长模式选择的对策建议，为国家和地方科学制定城镇化战略提供研究支撑。

This study aims to explore environment friendly urbanization strategies in China, regarding the sustainability of urban wastewater infrastructures. First, the study will summarize the changing patterns of urban spatial growth, the variations of land use type and intensity of major cities in China over the last ten years. It will also analyze the evolutionary characteristics of the amounts, structures and layouts of urban wastewater infrastructures in the context of rapid urbanization. Subsequently, the key impacts of urban spatial growth on wastewater infrastructures are to be identified. Second, this study will apply theories and methods of complex system analysis to develop an urban spatial growth simulation model based on land use change, and an urban wastewater infrastructure planning model based on a multi-objective optimization algorithm. Furthermore, the two models will be integrated, at a land plot scale, into a comprehensive computational system. Third, the integrated model will be operationalized in case studies. Typical urban spatial growth scenarios will be constructed and the responsive changes in system structures and layouts of the water environmental infrastructures will be examined for a few selected cities/urban areas. Forth this study will assess the sustainability of the urban wastewater infrastructures in different scenarios, regarding economic and environmental effectiveness as well as system resilience. Lastly, this study will discuss and present key implications for future urban spatial growth (including urban growth rate, spatial development and conservation, and intensified land use, etc.), aiming at a gradual improvement of the infrastructure's sustainability. This study will provide valuable insights to urban growth and its environmental effects and is therefore believed to facilitate a rational decision-making process, at both national and local levels, as a guiding variable for China's contemporary urbanization strategy.