Although the effect of lock-in in Ring Laser Gyroscope (RLG) can be reduced sharply by introducing mechanical dither into the input of RLG, there is still much large RLG readout error, which is unacceptable for medium/high-precision inertial navigation, due to the appearance of dynamic lock-ins. Superimposing noise on periodic dither signal can reduce the influence of dynamic lock-ins further. The relationships of RLG output’s deviation from mean and dispersion coefficient with noise intensity are analyzed with the inputs of both single noise and compound dither (periodic dither superimposed with noise), respectively. The results show that single noise is less practical than compound dither.