网络安全是目前信息系统应用的一个重要研究方向，如何确定用户身份以控制用户对信息资源的访问，是其中的一个重要问题。
Network security is an important research area in the application of information system now, How to implement effective access control based on user's identity is very important.
EMS是对SCADA, AGC和网络分析等自动化“岛”的集成，电力市场技术支持系统又是对EMS和信息系统等自动化“岛”的集成。
EMS is an integration of SCADA, AGC and network analysis technologies, while the power market technical support system is an integration of EMS and information technology.
对计算机网络信息系统所存在的风险进行分类，论述了对风险进行控制的方法。
This paper analysis and sort the risk types in network information system and presents the methods of risk control for computer network information system.
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