采用层次分析法和系统动力学法，对城市轨道交通PPP项目运营期风险因素进行识别，建立风险系统流图；在层次分析法和熵值法确定风险因素权重的基础上，运用Vensim PLE软件评估项目的总体风险水平，得出城市轨道交通PPP项目运营期风险SD模型仿真结果。

This paper identifies risk elements of urban rail transit PPP project in operation period and sets up risk system flow diagram with adoption of analytic hierarchy process and system dynamics; It valuats the overall risk level of the project with Vensim PLE on the basis of confirming the weight of risks with analytic hierarchy process and entropy method and then finds out risk SD model simulation results of rail transit during operation period.