保护倒换时间是评估网状波分复用网络保护方法性能的一项重要指标 ,本文就专门路径保护、共享路径保护以及共享链路保护三种保护方法 ,分别建立了各自对应的保护倒换时间计算模型 ,然后分析了影响保护倒换时间的主要因素 ,并在此基础上提出了相应的优化策略和解决方案 ,本文结果对于正确选择保护方法具有一定的参考价值 . Protection switching time is an important index to evaluate the performance of mesh WDM network protection method. In this paper, three protection methods, ie special path protection, shared path protection and shared link protection, are established respectively, and corresponding protection switching time calculation Model, and then analyzes the main factors that affect the protection switching time. Based on this, the corresponding optimization strategies and solutions are proposed. The results of this paper have certain reference value for the correct selection of protection methods.