PPP项目股权结构的确定和优化是PPP项目成功的重要保障之一，有利于项目治理、均衡各方利益与风险分担等。本申请将系统研究PPP项目股权结构优化相关问题，分析股权结构的关键影响因素，并提出其在不确定性、多目标冲突、联动调整等复杂环境下的优化策略：1)识别PPP股权结构优化目标与功能定义，结合数据挖掘提炼其关键影响因素及因果关系；2)使用数值模拟分析风险因素对项目收益的影响，通过对项目干系人的调研和访谈明确其利益诉求，构建不确定性条件下PPP项目股权结构的多目标优化模型并求解；3)考虑股权结构与特许期的联动调整，根据理论推导和因素分析揭示其相互作用机理；4)通过多主体模拟仿真验证PPP项目股权结构优化的有关原则、模型和方法。本申请在研究对象、研究方法等方面对现有研究进行了拓展和完善，既可为项目各参与方就PPP项目股权结构的有关谈判提供参考，也可为相关法规和政策的制定提供支持。

The determination and optimization of equity structure is one of the critical successful factors for public-private partnerships (PPP) projects, which will facilitate project governance, balance interests and risk-sharing of project stakeholders as well as protect the public interests, etc. To overcome the limitations of past studies, this research focuses on systematic optimization of equity structure of PPP projects, including identifying its key influencing factors, proposing optimization strategies and methods under uncertain environment, multi-objectives and joint-adjustment: 1) to identify comprehensively the optimization objectives and functional definitions of PPP equity structure optimization, and to depict associated key influencing factors as well as the inherent causality between them using data mining method; 2) to analyze the impacts of uncertain risk factors on project revenue using numerical simulation analysis method; to explicit the main incentives and demands of various stakeholders through investigation and interview and to establish a multi-objective optimization model for PPP equity structure under uncertain conditions; 3) to depict the inherent interaction relationship between the equity structure and concession period by theory inference and factor analysis so as to propose their joint-adjustment mechanisms; 4) to establish the decision principles and optimization model of equity structure for PPP projects through multi-agent simulation and then to verify the principles and model by case studies. This research expands and improves the existing researches in particular on research scope and research method. The conclusions could server as reference for PPP project stakeholders during contract negotiation on equity structure and provide guidance for the public during relevant regulations and policy making.