A method and system for selecting members of a weather forecast set includes selecting a data disturbance mode based on background field of digital model, electric power production operation conditionand mesoscale numerical weather forecast mode, determining the weather forecast set members based on the data disturbance mode; based on the meteorological data obtained by the weather forecasting ensemble members and the measured data, evaluating the ensemble forecasting effect according to the preset forecasting effect standard. The data disturbance mode includes the background field data disturbance, numerical model physical process scheme disturbance and data assimilation method disturbance. According to the present invention, at the three aspects of the background field data disturbance,the numerical model physical process scheme disturbance considering the electric power application and the data assimilation method disturbance, the set forecasting members are constructed, by evaluating the set forecasting effect according to the preset forecasting effect standard, the set forecasting members whose forecasting effect meets the preset standard can be selected, and the supportingability of meteorological forecasting to the electric power dispatching and transportation inspection can be effectively improved.