With　the　continuous　maturity　and　development　of　single　hardware　security　mechanism,　it　has　been　widely　used　in　the　field　of　information　technology,　but　the　single　hardware　mechanism　has　insufficient　security　guarantee　in　its　own　supporting　drivers　and　other　key　programs.　In　response　to　this　problem,　this　article　proposes　a　trusted　isolation　model　based　on　the　noninterference　theory　and　gives　a　formal　proof.　The　realization　is　based　on　the　trusted　platform　control　module　(TPCM)　hardware　mechanism　by　introducing　a　secure　memory　bar　to　provide　a　way　to　achieve　a　trusted　dual-system　isolation　guarantee.　The　hardware　interface　of　secure　memory　module　is　consistent　with　that　of　ordinary　memory　module,　which　is　widely　used.　It　can　improve　the　security　guarantee　ability　of　trusted　computing　platform,　and　has　a　good　reference　value　for　the　design　and　application　of　trusted　computing　platform　equipment.