Abstract: The important information systems security is of high importance for the national economic and social system. It is an urgent task to grasp the security safeguard capability of the important information systems in our country under the present state. This paper has made a close study of the traits and requirements in important information systems security and has analyzed two kinds of different information security evaluation methods. Based on integrated scientific idea, this paper has put up a framework of important information systems security safeguard capacity evaluation index system to provide reference for investigation.

Key words: security evaluation, safeguard capability, network attack and defense, index system