With the improvement of the performance of inertial measurement unit, the requirement of detection accuracy is getting higher and higher. However, constantly improving the accuracy of the turntable requires higher costs and even cannot be achieved in the short term. From the perspective of engineering application, the characteristics of turntable noise and its influence on gyro performance testing are analyzed in this paper. According to the reason of the speed fluctuation of the turntable, it is analyzed that the speed fluctuation is the periodic error of the non-fixed period. Through theoretical derivation and measurement data processing, it is concluded that the fluctuation is periodically fixed in the position domain. Therefore, a notch filter with adaptive frequency adjustment can be designed to compensate the gyro output error caused by the speed fluctuation of the turntable. This method can be realized in engineering and verified by the measured data, and the obvious effect is obtained.