With large-scale injection of new energy into power system and the development of demand side enabling technology the scheduling technology with flexible loads becomes a hot issue on automatic dispatching field.Therefore,this paper proposes a day-ahead scheduling technology covering 3 kinds of typical flexible loads,which provides technical support for the coordinated scheduling of resources on all of generating,grid and demand sides.Based on the existing automatic dispatching system,a day-head scheduling framework is designed,considering flexible loads.Flexible loads are classified according to the users'energy consumption characteristics,and their optimization models are built.At last,based on the provincial power system data,day-ahead scheduling simulations are conducted.With these simulation results,the influences of flexible loads on system are analyzed and the mentioned scheduling technology is verified.