电力线通讯是利用电网来传输声音和数据信息。介绍了电力线网络的应用的网络服务 ,分析了电网中存在的信号干扰 ,建立了电力线网络媒质接入层的仿真模型 ,其中包括对干扰信号的仿真。阐述了ALOHA协议和冲突避免的轮询接入协议 ,并利用仿真模型比较这两种不同的媒质接入协议在无干扰和受干扰时的网络性能 Power line communication is the use of the power grid to transmit voice and data messages. The network service of power line network is introduced, the signal interference existing in power network is analyzed, and the simulation model of medium access layer of power line network is established, including the simulation of interference signal. The ALOHA protocol and collision avoidance polled access protocol are described, and the simulation model is used to compare the performance of the two different media access protocols in non-interference and interference