The simulation control and display system for AC & DC power grid based on real-time simulation, which is developed by CSG these years, is introduced in this paper. In addition, the key technologies in the system construction are expounded, including heterogeneous platform model mapping, interface communication, simulation control and system display. Real-time simulation technology and dispatching automation technology are organically integrated in the mirror system. This system takes the actual power grid operation section as the simulation initial state, and establishes a simulated system which is highly similar to the actual operating state of the power grid, and can realize the control interaction of the simulation process and the image display of the simulation results. The mirror system would become an effective platform and a new application platform for real-time simulation calculation, dispatching and operation training, automation application testing, new technology development of AC & DC power grids.