[摘要] 在本文中，首先概括了网络设备总体特征和工作原理，接着在分析了一个重要的数据结构device后，重点剖析了网络设备的整个初始化工作过程；简单地分析了设备的打开和关闭的操作后，是有关数据包的传输和接收的分析；在最后，本文对写网络设备驱动程序做了一个总结。以上的每部分的分析，都是在NE2000以太网卡的基础上进行的。在附录中是一个虚拟的字符设备驱动程序以及写这个程序的体会，该程序已成功使用过，它是在网络设备分析之前本人做的一个小小的试验。-[Abstract] In this article, the first outlines the general characteristics of the network equipment and works, followed in the analysis of an important device data structure, focusing on the analysis of the initialization process of the network equipment　simple analysis of the device to open and shut down the operation, after the analysis of the transmission and reception of the packet　Finally, this paper to write network device driver made a conclusion. Each of the above part of the analysis are carried out on the basis of the NE2000 Ethernet card. In the appendix is ​ ​ a virtual character device drivers as well as the experience of writing this program, the program has been successfully used, it is the analysis of the network equipment before I do a little experiment.