随着中国教育科研网CERNET发展的深入,高校Internet的建设已由校级主干网进入院系级阶段。本文对院系级Internet的特点和建设中遇到的问题进行了分析,并对现有建设方案进行了比较,在此基础上提出了一套基于网络地址翻译和端口代理技术的软件混合建设方案。经实际使用证明,这种方案投入资金低,容易实施,稳定可靠 With the deepening of the CERNET development of China Education and Research Network, the construction of Internet in colleges and universities has entered the department-level stage by the school-level backbone network. This article analyzes the characteristics of college-level Internet and the problems encountered in the construction, and compares the existing construction schemes. Based on this, a set of software hybrid construction scheme based on network address translation and port proxy technology is proposed . The actual use of proof, this program is low investment, easy to implement, stable and reliable