The　Trust　Computing　Group　Specifications　specify　all　components　running　on　the　trusted　computing　platform　should　be　trusted,　which　seriously　restrained　the　applications　of　trusted　computing　platform.　This　paper　proposes　a　trusted　terminal　computer　model　tolerating　untrusted　components.　Comparing　with　the　existing　trusted　platforms,　the　model　allows　untrusted　components　loading　and　assures　the　security　results　be　expected　and　controlled.　The　model　includes　trusted　domains　and　untrusted　domains　tolerating　untrusted　components.　With　the　non-interference　theory,　an　untrusted　component-tolerating　mechanism　is　designed　and　reasons　out　the　sufficient　conditions　about　the　trusted　domain　can　run　trustfully.　Based　on　the　theory　model,　provides　a　detailed　physical　model　and　proves　it　be　a　trusted　terminal　computer　model.