Dynamic　multi-path　trust　chain　(DMPTC)　is　a　software　type　and　character　based　mechanism　to　assure　system　trustworthiness.　DMPTC　differentiates　static　system　software　and　dynamic　application　software　and　takes　different　ways　and　policies　to　control　the　loading　and　running　of　various　executable　codes.　The　goal　of　DMPTC　is　to　build　a　trusted　computing　platform　by　making　computing　platform　only　load　and　run　trustworthy　executables.　DMPTC　can　be　used　to:　1)　resist　malicious　codes　(including　known　and　unknown　virus)　which　are　the　most　serious　threats　to　information　systems,　so　as　to　improve　system　continuity　of　operation;　and　2)　help　to　manage　and　control　what　applications　can　be　executed　in　business　systems,　improve　their　cost-effectiveness　and　productivity　efficiency.　DMPTC　mainly　uses　the　hash　value　of　executables　to　verify　their　authenticity　and　integrity　which　is　always　a　time-exhausted　process;　However,　DMPTC　gives　great　consideration　to　the　impact　it　causes　to　system　performance.　Based　on　the　attributes　of　various　executables　and　by　taking　advantage　of　Windows　interior　security　mechanisms,　DMPTC　reduces　the　time　cost　of　the　executables　verification　process　greatly.　The　testing　of　DMPTC　implemented　on　Windows　platform　shows　that　the　performance　loss　caused　by　DMPTC　is　lower　than　1%,　and　it　is　this　optimization　result　that　ultimately　assures　the　flexibility　and　utility　of　DMPTC.