Abstract: A kind of polarization maintaining fiber ring resonator used in fiber ring resonator sensor for angular velocity measurement is reported in this paper.The measurement principle is based on Sagnac effect.So the system is composed of a laser with narrow spectra,fiber resonator,detector and other control circuits.According to the numerical calculation and experimental results,several important optical parameters,which have influence on the performance of system,are analyzed and optimized.Now the fiber ring resonator has been adopted in the sensor system.