In order to identify the parameters of synchronous machine, the relationship between the d, q-axis flux and stator current and excitation voltage were studied, the model of synchronous machine was built by using current as variables. The gain and phase of different parameters with range frequencies were obtained by analyzing the standstill frequency response curves. The model and the state-space equations of synchronous machine were simplified with the gain and phase to replace the relevant term in characteristic transfer functions which represented d, q-axis electromagnetic parameters. The experimental data process method was improved and the parameters of the machine were identified based on the status analysis of the machine at the open field winding and the open stator winding. The parameters have a good consistency to the measured parameters with another test method, and the effectiveness of the proposed parameter identification method is verified.