在对Lyot型光纤消偏器的特性进行系统的理论分析的基础上，首次推导出并讨论了其偏振度与相应变量之间的函数关系。实际制作了偏振度为2．0％的Lyot型光纤消偏器，并由此验证了理论分析结果。 Based on the systematic theoretical analysis of the characteristics of Lyot fiber depolarizer, the relationship between the polarization degree and the corresponding variables was deduced and discussed for the first time. The Lyot-type fiber depolarizer with a polarization degree of 2.0% was actually fabricated, and the theoretical analysis results were verified.