The invention relates to an electric power system operation analogy method. A circuit waving event and an electric power system operation are put into one framework to be analyzed, the circuit waving amplitude is calculated through the real-measured information of the waving of a circuit, then the failure rate of the circuit is calculated, then power grid electromechanical transient stimulation is conducted, and therefore the analog stimulation result of the circuit waving to the operation of the whole electric system is obtained. Due to the fact that the geographical factors such as external meteorological conditions, circuit parameters, power transmission corridor distribution are provided, the circuit waving amplitude can be calculated in a stimulated mode and the probability of occurrence of trip of the circuit can be judged, a short-circuit fault can be generated randomly according to the fault probability, then electromechanical transient analog analysis is conducted on the short-circuit fault, and the system stability is analyzed.