Abstract: The fault of distribution networks with high penetration of electric vehicles（EVs） may have an expanded impact on the operation of distribution networks and transportation networks due to the coupling interaction between the two types of networks.Clarifying the influence of EV charging load on the operation state of distribution networks and transportation networks and the charging load distribution of the charging station is the basis for timely preventing the fault influence. An evolution analysis method for charging characteristics under distribution network faults considering the interactions between power and transportation is proposed. Firstly, considering the influence of the charging load change on the distribution network under distribution network faults, a variable-step-size repeating power flow model considering the sensitivity of the charging load variation is proposed to calculate the total supply capability（TSC） of the distribution network. Secondly, an evolution model of traffic operation state under the fault influences of the distribution network is constructed by combining bounded rational decision-making of users and dynamic traffic equilibrium. Further, taking EV travelling and charging as a coupling unit, the influence of power supply capacity on charging behavior is described based on the improved Davidson function, and the interaction relationship between the two types of networks is established. Finally, the evolution law of charging load and its influence under distribution network faults considering network coupling are simulated and analyzed.