Abstract: Aiming at the application scenarios of electric vehicle charging and changing stations, this paper established an economic analysis model of the combined system from the perspective of low carbon. The model reasonably evaluates the investment cost of photovoltaic power generation and battery energy storage, the annual operating cost, the delaying grid upgrade benefit, the benefits of energy saving and emission reduction, and the revenue of power generation. This paper puts forward the calculation method of the annual total revenue of the combined system considering the system power balance and the constraints of photovoltaic and energy storage operation. A charging station in Chongqing as an example the economic analysis model is analyzed, the results show that the application of combined system has a certain economic benefits, the delaying grid upgrade benefit is the main income at current stage. As the carbon trading market further, the economic benefits of combined system will be a new growth point. At the same time, the economic benefit of the combined system is closely related to the service life of battery energy storage, so the scale of battery energy storage capacity should be reasonably configured and the charge and discharge operation strategy should be optimized.