探作系统的安全性已引起人们的广泛重视，但安全操作系统已不再仅限于单机安全的范畴，它需要在网络安全的环境下进行讨论，多级安全TCP/IP就是安全操作系统在网络上的拓展，是其强制存取控制机制在网络安全服务上的应用.%People has paid more and more attention to security of OS. Application of secure OS has extended from single host to network.MLS TCP/IP is the extension to network of secure OS and application in secure network service of MAC.
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