Collaborative scheduling optimization strategy based on equivalence theory was proposed for multi-source power. Busload contains a variety of types of power supply. In this paper, busload forecast was divided into pure load forecast and unit power in lower grid. These units power where were in region grid were as the equivalent unit. The optimization variables include the equivalent units and direct regulating units of provincial grid in scheduling decision model. To solve the model, direct regulating units scheduling and equivalent unit scheduling considering security constraints were obtained, unit scheduling where were in region grid were finally determined. Results of calculation examples show that the method is simple and effective, can realize coordination and complementation of power resources in the whole province, and can improve the level of safety and economy about grid operation.