Thyristor　valve　is　one　of　the　key　equipments　for　ultra　high　voltage　direct　current　(UHVDC)　power　transmission　projects.　Before　being　installed　on　site,　they　need　to　be　tested　in　a　laboratory　in　order　to　verify　their　operational　performance　to　satisfy　the　technical　specification　of　project　related.　Test　facilities　for　operational　tests　of　thyristor　valves　are　supposed　to　enable　to　undertake　more　severe　electrical　stresses　than　those　being　applied　in　the　thyristor　valves　under　test　(test　objects).　On　the　other　hand,　the　stresses　applied　into　the　test　objects　are　neither　higher　nor　lower　than　specified　by　the　specification,　because　inappropriate　stresses　applied　would　result　in　incorrect　evaluation　of　performance　on　the　test　objects,　more　seriously,　would　cuase　the　damage　of　test　objects　with　expensive　cost　losing.　Generally,　the　process　of　operational　tests　is　complicated　and　performed　in　a　complex　synthetic　test　circuit　(hereafter　as　STC),　where　there　are　a　lot　of　sensors　used　for　measuring,　monitoring　and　protection　on　line　to　ensure　that　the　test　circuit　functions　in　good　condition.　Therefore,　the　measuring　systems　embedded　play　a　core　role　in　STC,　acting　like　＂eyes＂.　Based　on　the　first　project　of　building　up　a　STC　in　China,　experience　of　planning　measuring　systems　is　summarized　so　as　to　be　referenced　by　related　engineers.