HNI是为并行机群系统 SNOW研制的高性能网络接口板 ,它可以高效地支持 SNOW系统网络 Homer互联协议和 DSM协议 .HNI采用协议处理器和专门设计的协议硬件加速部件 ,实现了多用户访问模式 ,具有很强的协议处理能力 .首先给出了 HNI的结构方案 ;介绍了它的逻辑实现 ;然后对 HNI进行了测试并对测试结果进行了分析 . HNI is a high-performance network interface board developed for parallel cluster system SNOW, which can efficiently support Homer interconnection protocol and DSM protocol of SNOW system network.HNI adopts protocol processor and specially designed protocol hardware acceleration components to realize multi-user access mode , Has a strong ability to deal with the protocol.First, the structure of HNI is given, its logical implementation is introduced, then HNI is tested and the test results are analyzed.