Abstract: The excitation system modeling needs to convert the actual parameters of the excitation regulator into the parameter values of the standard model in the power system analysis and synthesis program（PSASP）.There are many types of excitation regulators in the project,resulting in errors in the parameter conversion between the regulator models during the modeling test.The excitation regulator used in engineering was investigated,the three most used mathematical models of regulator were summarized,and the physical significance of each parameter in the model was described in detail. The method of converting different regulator model parameters into PSASP standard model parameters was proposed.The proposed method of standardized conversion of different regulator model parameters was verified by experiment and simulation.Combined with the actual excitation model parameter values in the project,the PSASP standard model parameters were obtained through the proposed method,and the stator voltage step and the rise time of stator voltage step were simulated in PSASP.The comparison shows that the simulation results are basically consistent with the test results,which proves that the proposed standardized conversion method of model parameters of different regulators can be applied to the modeling of excitation system.