The finite element model of the resonator of hemispherical resonator gyro(HRG) was established, the modal analysis about the resonator was performed in the application of the element software ANSYS. The natural frequency and correlative vibrating model of the resonator were confirmed. It has been proved that the model is reasonable and the calculation result is accurate which is consistent with the natural frequencies obtained from the experiments. The parameters of structure that had effect on natural frequency and vibrating model of the resonator were analyzed. Through optimum design the resonator’s frequency was less than other natural frequencies by 1 kHz and the vibrating modal coupling was avoided.