Abstract: Aiming at the problem of high construction and operation cost of electric vehicle charging station,low land utilization rate and single function,the paper proposes a capacity optimization method of charging-PV-storage integrated station for electric vehicles.Considering photovoltaic output fluctuation and the uncertainty of charging load of the electric vehicles,the capacity configuration in an uncertain environment is analyzed to ensure the feasibility of the optimal scheme. Based on opportunity-constrained programming,the model of the charging-PV-storage integrated station is established with the goal of minimizing the construction and operation cost,the constraints containing random variables in the model are deterministically transformed through sequence operation theory,and CPLEX is used as the model solving tool. In the end,an example is used to verify the effectiveness of the proposed model and method.