Abstract: Operating system camoulfage can make the host ifngerprint characteristic to hide the real operating system information, prevent the network attack, and ensure the safety of the operating system. Currently used in network attack tools are developed on the basis of a particular operating system, if the operating system's real information disguised will greatly reduce the system against damage. This paper studies the operating system camoulfage ifngerprint characteristic method and implementation technology, and based on the operating system of the Internet protocol, ICMP, TCP and UDP camoulfage was tested, the results show that the technology and method can to a certain extent to ensure the safety of the operating system.