In the practice of hemispherical resonator gyro, its operating state will be influenced by environment, especially by the linear libration. When the mass of hemispherical resonator is asymmetric along the angle of circumference, the effect of the inertia force causing by linear libration on the hemispherical resonator′s operating state is analyzed, and the change of its operating state is judged via investigating the change of the procession angle. The deducing results indicate that only when the frequency of linear libration is equal to gyro's inherent frequency , will the linear libration influence the operating state of hemispherical resonator.