为了明确城市道路网络中不同路段的重要程度，提出基于交通需求满足率的城市道路网络关键路段识别方法，研究不同场景下路段失效对于交通出行的影响，并对城市道路网络中的路段进行关键性识别和排序。首先，对城市道路网络建模方法进行了介绍，并引入了通行能力失效系数，用以表征路段失效程度；然后，介绍了5种现有评价指标作为参照，并在交通网络分配框架下，基于出行时间预算的概念提出了交通需求满足率指标的概念和计算方法，在此基础上介绍了关键路段识别方法和一致性对比方法；最后，采用两个基准测试网络，模拟不同场景下的关键路段识别结果，并进行各类指标的对比分析，验证了方法的有效性。结果表明：交通需求满足率指标是一个全局性指标，能够刻画交通需求、路段失效程度、出行时间预算等因素对关键路段识别结果的影响，并且其识别结果与基于路段重要性指标和路网效率指标的识别结果具有强或者非常强的正相关性。研究结果有助于交通管理者加深对城市道路网络的认知，为提升城市道路网络韧性提供理论指导。

In order to identify the link criticality in the urban road network, the identification method of critical links in the urban road network based on the satisfied traffic demand rate was proposed. The impact of link failures on travels under different scenarios is studied, and the link criticality was identified and ranked. Firstly, the modeling method of urban road network was introduced, and the failure coefficient of link capacity was introduced to represent the failure degree of links. Then, five existing evaluation indicators were introduced as the reference, the concept and calculation method of satisfied traffic demand rate were proposed based on the concept of travel time budget in the framework of traffic assignment, and the identification method and ranking consistency comparison method of critical links were introduced. Finally, two benchmark networks were used to simulate the identification results of critical links under different scenarios, and the comparative analysis of various indicators were conducted to validate the effectiveness of the proposed method. The results show that the satisfied traffic demand rate is a global network-wide indicator, which can characterize the impact of factors such as traffic demand, link failure severity, and travel time budget on the results of critical link identification. Moreover, its identification results have a strong or very strong positive correlation with the results based on link importance and traffic network efficiency indicator. This study can help traffic managers deepen their understanding of urban road networks and provide theoretical guidance for enhancing the resilience of urban road networks.