计算机网络安全建设是涉及我国经济发展、社会发展和国家安全的重大问题。本文结合网络安全建设的全面信息,在对网络系统详细的需求分析基础上,依照计算机网络安全设计目标和计算机网络安全系统的总体规划,设计了一个完整的、立体的、多层次的网络安全防御体系。 The construction of computer network security is a major issue that involves China’s economic development, social development and national security. In this paper, based on the comprehensive information of network security construction, based on the detailed requirement analysis of network system, in accordance with the goal of computer network security design and the overall plan of computer network security system, a complete, three-dimensional and multi-level network security defense system.