以太网线性保护是PTN网络满足运营商级需求的一个重要特性。为保证业务在PTN网络设备之间传输时具有可靠的传输通道以及故障链路的自愈能力，讨论基于G.8031协议的线性1∶1保护倒换机制，实现主备链路满足电信级50 ms以内的快速自动保换倒换功能，提高了PTN网络的可靠性。 Ethernet linear protection is an important feature of PTN networks to meet carrier-class requirements. In order to ensure the reliable transmission channel and the self-healing ability of the failed link when the service is transmitted between PTN network devices, a linear 1: 1 protection switching mechanism based on the G.8031 protocol is discussed, and the primary and backup links meet the carrier-class 50 ms  within the rapid automatic protection switching function, improve the reliability of the PTN network. 