Meteorological conditions have a significant impact on the safe production of electric power, which is of great significance to carry out the research of the electricity meteorological service. Oriented by the user's demand, combined with features of meteorological data, thiessen polygon corresponding weather station is used in live and nowcasting, and district and county administrative divisions is used in short-term forecasts and early warnings, to divide transmission lines and substations respectively, and then establish nearest neighbor relations. At the same time, meteorological comprehensive influence grade standard is designed to improve the fineness of service. A system of electricity meteorological service is built by GIS and database technology, which includes information about live monitoring, nowcasting, short-term predicting, signal of warning, historical queries, service material and so on. The results of the business application show that the system is stable, and is able to enhance the level of meteorological services, ensure the safety of power system.