This paper takes the park microgrid as the research object,and the electric vehicles in the charging station are divided into two main types: private electric vehicles and electric buses. Firstly, the travel time characteristics of different types of electric vehicles are analysed in this paper. The power interaction strategy between the combined energy storage equipment of electric vehicle charging station and the microgrid power system, the interactive power calculation model are constructed. Then, grading the microgrid feeder area with the switch as the boundary, the isolation operation methods for different faults are proposed. Based on the traditional evaluation indicators, the evaluation indexes of average charging depth, average discharge depth and average load reduction depth of electric vehicle charging stations are proposed. Finally, Sequential Monte Carlo intelligent algorithm is adopted for simulation. The power distribution network modified based on the F4 feeder area of the reliability evaluation test system of IEEE distribution system RTBS Bus 6 is used as an example to carry out simulation calculation. The calculation results show that after the electric vehicle charging station responding to the V2G technology is connected to the microgrid, a reasonable power interaction strategy can effectively improve the reliability of the microgrid under island operation.