Based　on　the　pseudo-rigid-body　model　and　unitary　dimension　of　the　kinematic　parameters,　the　dimensional　model　of　the　3-RUU　micro-motion　parallel　mechanism　is　established,　on　which　all　the　possible　dimensional　parameter　combinations　of　the　3-RUU　micro-motion　parallel　mechanism　are　expressed　in　a　closed　region　and　each　point　in　the　region　corresponds　a　cognation　of　mechanisms　having　the　same　or　similar　kinematic　characters.　The　motion　property　of　the　micro-manipulation　is　analyzed,　three　kinematic　evaluation　indexes　of　the　micro-motion　mechanism　including　the　workspace　volume　value,　workspace　shape　value　and　condition　number　of　the　constant　Jacobian　matrix　are　presented,　and　the　performance　index　atlas　describing　the　relationships　between　the　dimensional　parameter　combinations　and　mechanism　performances　are　protracted　based　on　the　proposed　dimensional　model　and　evaluation　indexes.