Trust　chain　is　a　key　component　of　trusted　computing　platform.　How　to　test　the　implementations　of　trust　chain　for　conformance　to　the　specifications　is　a　signification　research　work.　Therefore,　this　paper　focuses　on　the　state　transition　characters　of　specifications　of　trust　chain　and　formalizes　these　characters　based　on　state　machine　theory.　And　the　authors　analyzes　the　testing　sequence　generation　procedures　with　the　unique　input/output(UIO)　sequences.　This　paper　provides　a　new　valuable　way　for　studying　the　conformance　testing　for　trust　chain　of　Trusted　Computing　Platform.　©　2005　by　Binary　Information　Press.