In　evaluation　of　robotic　kinematic　dexterity　performance,　there　are　many　different　indexes　to　express　robotic　kinematic　dexterity,　and　those　different　indexes　tend　to　have　different　degree　of　correlations　among　them.　Some　correlations　are　very　remarkable,　so　the　provided　information　may　be　overlapped.　New　indexes　are　created　by　using　the　principal　component　analysis.　These　new　indexes　which　are　related　to　each　other　can　reflect　robotic　kinematic　dexterity　comprehensively.　Comprehensive　evaluation　of　kinematic　dexterity　of　the　planar　2R　and　three　different　configurations　spatial　3R　manipulators　are　described　with　the　different　dimensions　and　same　configuration,　by　using　principal　component　analysis　which　is　characterized　by　lowering　dimension　gradually　and　dealing　comprehensively,　and　correlations　between　the　various　kinematic　dexterity　indexes　are　also　presented.　The　results　show　that　the　five　kinematic　dexterity　indexes　of　the　planar　2R　and　PUMA　spatial　3R　manipulator　are　positively　correlated　and　have　the　same　change　pattern.　A　comprehensive　dexterity　performance　index　can　represent　the　five　indexes　information.　For　the　five　kinematic　dexterity　indexes　of　other　two　spatial　3R　manipulators,　some　indexes　are　positively　correlated　and　some　indexes　are　negatively　correlated.　A　variable　can　be　used　for　representing　the　information　of　manipulators　isotropic　indexes;　a　variable　can　be　used　for　representing　the　indexes　information　of　the　motion　ability　of　manipulators.　©　2014　Journal　of　Mechanical　Engineering.