With　a　fast　growing　pervasive　computing,　especially　cloud　computing,　the　behaviour　measurement　is　at　the　core　and　plays　a　vital　role.　A　new　behaviour　measurement　tailored　for　Multitenants　in　cloud　computing　is　needed　urgently　to　fundamentally　establish　trust　relationship.　Based　on　our　previous　research,　we　propose　an　improved　trust　relationship　scheme　which　captures　the　world　of　cloud　computing　where　multitenants　share　the　same　physical　computing　platform.　Here,　we　first　present　the　related　work　on　multitenant　behaviour;　secondly,　we　give　the　scheme　of　behaviour　measurement　where　decoupling　of　multitenants　is　taken　into　account;　thirdly,　we　explicitly　explain　our　decoupling　algorithm　for　multitenants;　fourthly,　we　introduce　a　new　way　of　similarity　calculation　for　deviation　control,　which　fits　the　coupled　multitenants　under　study　well;　lastly,　we　design　the　experiments　to　test　our　scheme.