The parameters of steam turbine governing system based on power response characteristics are identified. A simplified model is adopted to overcome the difficulty of generator modeling. The identification process and optimization objective function are designed by analyzing the relevance of the influence of parameters on the power characteristic. Then using an advanced numerical method, the parameters of model are obtained. The simulative results of identification are compared with the measured value by PSASP, which show that the simulation results of the model built by new method are close to the measured value, and the steam turbine governing system model built in this paper reflects the actual response characteristics. The correctness and effectiveness of the new method are proved. Compared with the original identification method, the new method can realize more accurate identification of the model parameters. This work is supported by National Natural Science Foundation of China (No. 61203107) and Fundamental Research Funds for the Central Universities (No. 13MS90).