This paper mainly studies the unilateral signal detection method for resonant fiber-optic gyroscope,discusses the influence of thermally induced polarization noise on the resonance curve,and designs a signal detection method.The application effects of this detection method and traditional detection method are compared and analyzed,and the research results show that the proposed method shall suppress the influence of polarization noise on gyro accuracy.According to the simulation results,when the temperature changes by 0.003 ℃,the normalized amplitude error is significantly decreased from 0.2308 to 0.0298,thus verifies the effectiveness of the designed unilateral detection method,which effectively suppresses the adverse impact of polarization fluctuation noise on detection accuracy and improves the accuracy of detection results.