The　traditional　information　security　systems,　such　as　firewall,　intrusion　detection　and　anti-virus,　are　all　preventing　attacks　from　the　outside.　But　these　methods　can＇t　meet　the　various　security　requirements.　Therefore,　experts　appeal　to　solve　the　problems　from　the　inner.　Under　this　background,　TCG　proposed　the　conception　of　trusted　computing.　It　aims　to　improve　the　security　on　the　terminals.　At　present,　trusted　computing　and　its　related　researches　are　the　focus　and　trend　of　information　security　in　inland　and　oversea.　Trusted　computing　is　the　foundation　of　the　security,　and　it　may　solve　the　insecure　problem　caused　by　the　platform　of　hardware　in　PC.　Trust　chain　starts　from　the　trust　root.　TCG　introduces　the　idea　of　the　trusted　into　the　computing　environment,　but　there　is　still　not　the　formalized　uniform　description.　Trusted　computing　is　still　a　technology　but　not　a　theory,　and　the　basic　theory　model　has　not　been　established.　Noninterference　theory　is　introduced　into　the　domain　of　trusted　computing　to　construct　the　trusted　chain　theoretic　model.　The　basic　theory　of　the　computing　trusted　is　proposed　and　a　noninterference-based　trusted　chain　model　is　built　from　the　dynamic　point　of　view,　and　then　the　model　is　formalized　and　verified.　Finally,　the　process　of　start　up　based　on　Linux　operating　system　kernel　is　implemented.　The　implementation　provides　a　good　reference　for　the　development　and　application　of　the　trusted　computing　theory　as　well.