Abstract: To solve the profitability problem of electric vehicle leasing operators, an electric vehicle car-sharing dynamic cost and benefit evaluation model was established by taking the annual profit as the objective function. According to the field research and scenario prediction, the dynamic cost distribution and income of the large-scale electric vehicle leasing project were analyzed. The dynamic impact of key factors such as fiscal and taxation subsidy, vehicle purchase, charging pile and parking space allocation, leasing price and other factors on the profitability of operators were studied, and suggestions for reducing the cost and increasing the profit on car-sharing were put forward to solve the problem of car-sharing earnings difficulty. Results show that when the average car rental time reaches 3.5 hours, the project achieves profit and loss balance, and operation management cost, car purchase cost and site construction cost are the main costs of car-sharing, accounting for 42.40%, 27.21% and 20.03% of the total cost respectively; car-sharing operators should actively use national and local support policies for electric vehicles and car-sharing, and optimize on-board diagnostic systems to reduce costs.