Abstract: Considering that there are many untrusted components on the legacy OS,which leads to security operation's hidden troubles on the computing terminal,the paper proposes a new computing platform,which is based on the embedded system and tolerates untrusted components.In addition,the platform proposed in this paper doesn't need change hardware structure and the OS on the legacy terminal system.Secondly,the model assures the existence of untrusted components can't bring serious information security threats.At the same time,the paper also proposes a new integrity measurement method which integrates IMA and SB methods,offers effective security protection for the booting of the platform,the loading of the process and the running of the procedure.