For the resonator operating at n = 2 modes

electrostatic tuning is a commonly used method to reduce the permanent frequency mismatch. On the basis of the stiffness perturbation model for a ring

an intuitive and utility algorithm is introduced. In this algorithm

each tuning electrode is regarded as two rows of radial springs with negative stiffness

so that the theoretical model of ring resonator is successfully applied in the disk resonator gyroscope. Finally

the algorithm is verified by electrostatic tuning experiment

and matching of the two modes is realized. Results of experiments show that

the frequency split of resonators is decreased to about 0. 03 Hz from original about 15 Hz.