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This paper proposes a novel simulation system of the voltage sag problems in power distribution system based on the real-time monitoring data. It can improve the precision of the simulation results and reduce the number of the monitoring device needed. The overall framework of the simulation system is presented, and the method which can produce PSCAD simulation program using the database of the power supply department has been studied. The calibration principle of simulation program using real-time data has been proposed. The system function is shown through a practical example. The proposed method which combines the real-time data and simulation calculation provides good theoretical basis and technique for the research of the voltage sag problems in power distribution network.