通过对退偏陀螺的分析，指出偏振及双折射误差对其性能的影响不同于保偏光纤陀螺．为定量分析偏振过程、双折射误差，考虑到部分偏振光的实际存在，运用弥勒矩阵描述光路进程．在偏振误差的解析后，提出了限制退偏器的角度误差及采用高消光比的偏振器等措施来改善退偏陀螺性能，获得了０．１°／ｈ 精度全光纤退偏陀螺的设计方案 Through the analysis of the depolarized gyros, it is pointed out that the influence of the polarization and the birefringence error on the performance is different from that of the polarization maintaining fiber gyroscope. In order to quantitatively analyze the polarization process and the birefringence error, taking into account the actual existence of some polarized light, the Maitreya matrix is ​​used to describe the optical path process. After the analysis of the polarization error, this paper proposes some measures such as limiting the angle error of the depolarizer and using the polarizer with high extinction ratio to improve the performance of the depolarized gyroscope and obtain the design scheme of 0.1 ° / h precision full-fiber depolarized gyroscope