Abstract: In order to complete the power system optimal dispatch more accurately and efficiently, this paper establishes a power system optimal dispatch model with the goal of minimizing the operating cost of the power system based on the cyber-physical-social integration under the power market environment. It uses the object layer, the fusion layer and the decision-making layer to describe the phased flow direction and driving force of energy flow, information flow and cash flow, for making a comprehensive observation and accurate tracking of the main operating status and conversion process of each unit in the power system. By adjusting the dynamic output of each power production unit and power consumption unit, the power system operating state trajectory control can be done, which will optimize the changing process trajectory of the power system operating state and complete the optimal dispatch of the whole system. The analysis of calculation examples shows that the model fully improves the considerable controllability of the power system's operation trajectory. The analysis of calculation examples shows that the model improves the considerable controllability of the power system operation trajectory in all aspects. It completes the flexible and precise regulation and economic optimization dispatching of the entire operation domain of the power system by real-time acquisition, calculation, analysis, decision-making and control.