Abstract: In order to improve the identification accuracy of transient and sub-transient parameters of synchronous generators, a parameter identification method is proposed for synchronous generator based on trajectory sensitivity. Firstly, the method for selecting the data intervals is determined based on the trajectory sensitivity, and the measured trajectory sensitivity of the generator parameters is used as an index. According to the attenuation degree of the index, the measured data with more information of transient and sub-transient parameters are selected and used as the identification data so as to improve the identification accuracy of the corresponding parameters. And then, the robust optimization model is used as the optimization model of generator parameter identification to improve the anti-jamming ability of the parameter identification model. Case study has proved the effectiveness of the proposed method.