在无线传感器网络体系结构中,MAC(Medium Access Control)协议是保证网络高效通信的重要协议。无线传感器网络有着与传统无线网络明显不同的性能特点和技术要求。对于很多的MAC层协议而言,吞吐量很大程度上受到了物理信道的利用率和协议开销的限制。这里设计了一种基于一对多拓扑的无线传感器Mac层网络协议。最后,还通过NS-2(Network Simulator 2)仿真并比较该协议与现存无线传感器MAC层网络协议的网络性能。 In the wireless sensor network architecture, MAC (Medium Access Control) protocol is an important protocol to ensure efficient communication network. Wireless sensor networks have distinctly different performance characteristics and technical requirements from traditional wireless networks. For many MAC layer protocols, throughput is largely limited by the utilization of physical channels and protocol overhead. Here is a wireless sensor network layer protocol based on one-to-many topology. Finally, the network performance of this protocol with the existing wireless sensor MAC layer network protocol is also simulated and compared through NS-2 (Network Simulator 2).