Abstract: This paper primarily addresses the influence of large signal input on the resolution of the fence structure vibratory gyroscope and its interface circuit. The minimum angular rate change which can be sensed by gyroscope and its interface circuit is designed as 0.01°/s. When the effect of drive voltage and the difference of characters between sensitive capacitors and integrator capacitor are taken into account, the system may not detect a variation of angular rate as 0.01°/s with input angular rate larger than 10°/s. The drawback can be eliminated by integrating key component with the sensor.