| Operating system security is the base of computer system security, To assure the security of computer system , we must provide a secure operating system at first. Linux has been more and more widely used today, but the secure degree of Linux is low, so in this paper ,we produce a Linux-compatible secure operating system, named SLinux. Its design object is in accordance with the requirements of the fourth level, i.e. Structured Protection Level, of GB17859.For this purpose , we introduce such mechanism ,as identification & authentication ,MAC, least privilege manage, trusted path, password management .object reuse ,covert and channel analysis. Furthermore, we have some innovation, introduce the mechanism of network security and audit.
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