The large scale promotion of“coal to electricity”for clean heating in winter in northern China brings great pressure on the capacity upgrading of power grid and the safe operation in“peak load during winter”. Based on the summary and analysis of different types of electric heating equipment, an accurate prediction model of electric heating load based on thermal conditions of equipment, building types and outdoor climate conditions is proposed.And the application analysis is carried out in typical scenarios such as grid access, operation regulation and so on. The results show that this method plays a good guiding role in the investmenttransformation and optimal operation of power grid.