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The paper proposes a reliability analysis method based on Monte-Carlo simulation and fault-tree analysis method (FTA), with which the reliability of door system of metro vehicles in the urban rail is analysis. Given the states transfer rules, the simulation model of the door system based on FTA is built. With the model we make the reliability simulation based on Monte-Carlo method. The calculated results contain the failure rate of the top event and importance degrees of basic events. Then the dynamic simulation of the system reliability is made and the distribution of reliability is got. The simulation method proposed in the paper is more modular and convenient for application.