After intruducing the security demand from the computer area, this paper present the designing aim of the real time audit analysis system ( raas ), considering the trusted computer system evaluation criteria ( tcsec ) of us dod and common criteria for it security evaluation ( cc ) 本文首先介绍了计算机领域的安全需求,根据美国国防部的可信计算机评测标准(tcsec)和计算机信息系统的通用安全评价准则(commoncriteriaforitsecurityevaluation,cc)中提出的安全操作系统的审计标准,提出本系统的设计目的。