随着中小型企业的高速发展，对网络处理和传输性能提出了新的要求。由于网点接入路由器和终端接入设备年代较久，性能和扩展能力都出现了瓶颈，严重影响网点业务的发展和客户服务质量。为此本论文设计了一个中小型企业的网络工程，从而解决了由于设备性能低下出现瓶颈的问题，而且提高了企业网络工程的扩展能力。 本论文首先讨论了中小企业网的背景、意义、应用现状以及研究与开发现状，然后对OSPF协议、DHCP协议、VLAN的划分、静态路由以及数据流控制等相关技术理论作了简单的论述，其次结合工程项目，论述了企业网络的需求分析、整体设计，其中包括对IP地质的划分，网络拓扑图等做了分析和描述。接下来，论文着重讨论了基于OSPF协议的网络工程的设计和实现，详细地论述了各个协议的运用和实现方法。最后，对整个网络进行了测试。 关键词：网络工程；协议；性能；扩展 ABSTRACT With the rapid development of small and medium enterprises, this network processing and network transmission performance and scalability of terminal smooth raised new demands. As the network access routers and terminal access device's longer, performance and scalability bottlenecks have appeared, it affect the network business development and customer service. To this end this paper, an application of existing small and medium enterprises in network engineering, to solve the poor performance bottleneck because the equipment problems, and improve the ability of the corporate network expansion project. This paper first discusses the background of small and medium networks, meaning, application status, and research and development status, Then on the OSPF protocol, DHCP protocol, VLAN classification, static routing and data flow control and other related technology theory briefly discussed, Secondly, combined with the project, specifically addressing the needs of the corporate network analysis, overall design, including the division of IP addresses, network topology maps were analyzed and described. Next, the paper focused on the OSPF protocol-based network engineering design and implementation. Discussed in detail in the paper the use of various agreements and implementation methods. Finally, test the entire network. Keywords: Network engineering; protocol; performance; expansion