Trusted　Computing　Group　(TCG)　presented　Trusted　Computing　Specifications,　which　ensured　the　security　of　the　platform　and　applications　by　measuring　and　verifying　the　integrity　of　the　components.　The　boot　process　is　the　base　of　the　operating　system,　thus　implementing　trusted　boot　is　of　great　significance.　However,　the　trusted　boot　process　may　be　blocked　because　of　some　corrupted　components,　which　is　not　allowed　to　happen.　In　order　to　solve　this　case,　this　paper　proposed　a　failure　recovery　mechanism　based　on　USB　Key,　which　includes　comparison　of　the　existing　solutions　in　this　field,　analyzing　the　recovery　process　in　the　trusted　chain　transmission　based　on　USB　Key,　and　describing　the　overall　design　of　the　program,　PC-side　module　and　USB　Key　device-side　module　detailed　design.　Finally,　the　paper　makes　a　discussion　to　the　desired　result　of　the　solutions.　©　2010　IEEE.