In recent years more and more people have been paying attention to the development of electric vehicles. At the same time, due to the lack of innovation in business models, the promotion of electric vehicles has been relatively slow. The development model of electric vehicles is in urgent need of innovation. Considering the initial investment cost, operating costs, fuel cost and other expenses of electric vehicles, this paper designed a critical price model of alternative fuel vehicles in the whole life cycle from the consumers' point of view. The results showed that users can use the electric vehicles when the selling price is lower than the critical price. And the rise of oil prices, the reduction of the initial investment of electric vehicles and the imposition of carbon tax will help to improve the critical price and promote the development of electric vehicles. Four kinds of promotion models for the electric vehicle from three angles of risk transfer, risk reduction and risk sharing have been designed. The point of difference between critical price and current electricity price will be the expected per kWh for the promotion of electric vehicles has been put.