To reduce the destructive impact of cascading failure phenomenon on urban subway networks,the critical nodes and cascading failure phenomenon in subway network were studied based on the complex network theory. A topological struc-ture model of subway network was constructed by using the Space-L method. The evaluation indexes of key stations were pro-posed,and the key stations in the network were identified by using the entropy-weight TOPSIS method. A cascading failure model was constructed,and two load distribution strategies considering the directionality of lines and the importance of nodes were put forward. The influence of different attack strategies and load distribution strategies on the network invulnerability was analyzed,and the simulation analysis was conducted using the subway network in a city as a case. The results show that the key nodes of a city subway are mainly the transfer nodes and central nodes in the network. Under both random and intentional attack modes,when the node importance weight is set to a larger value,the descending range and descending speed in network efficiency and the maximum connectivity are lower,and redistributing the load according to the node importance can reduce the descending speed of network performance indexes. The research results can expand the research ideas of cascading fail-ure,so as to provide reference for the safe operation of subway networks.
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