介绍GAP网络隔离设备技术的工作原理,详细阐述其信息交换的方式和基本的构成模块,将GAP与同类安全技术作了技术比较,分析了早期产品优劣势,针对铁路计算机网络安全项目的要求和特点,提出了一个较为完整的解决方案。 This paper introduces the working principle of GAP network isolation equipment technology, elaborates its information exchange method and the basic constitutional module, compares technology of GAP with the same kind of security technology, analyzes advantages and disadvantages of early products, requirements of railway computer network security project and Features, put forward a more complete solution.