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In order to reduce the disaster of power network caused by the ice coating problem, and to provide a scientific reference for the electric power department to carry out ice prevention and melting ice, this paper developed an ice accretion forecasting and evaluation system. The system firstly through the comprehensive analysis of meteorological observations, ice accretion observations, ice accretion disasters and geographic information in the ice Accretion-prone area of overhead lines, the ice accretion weather threshold was determined. The stepwise regression analysis method was used to establish the ice thickness standard meteorological model, and the forecast results of the model were revised in combination with the topography. On this basis, the multi-decision weighted integration method is used to integrate the fine grid meteorological numerical forecast products of ECMWF and Japan to establish a short-term forecast model of ice thickness. Secondly, the system uses the Euclidean distance calculation method to establish a multi-index comprehensive index evaluation model for ice coating. The system is stable, intelligent and highly automated. The accuracy of the ice-covered forecast is high. The evaluation effect is consistent with the actual situation of the disaster, and the service effect is good. It has a good prospect of popularization and application.