Limited　motion　range　and　easily　happened　rotation　axis　drift　are　the　main　disadvantages　of　traditional　flexible　joint　of　parallel　robot.　In　order　to　promote　the　performance　of　flexure　joint,　a　new　design　of　open　thin-walled　flexure　joint　was　proposed.　According　to　the　range　of　motion　of　3RRR　parallel　robot,　the　geometry　of　joint　was　calculated　by　using　the　motion　range　of　joint　and　the　required　joint　stiffness　as　design　parameters.　And　the　structure　strength　of　joint　was　analyzed　via　ANSYS.　Torsion　is　the　deformation　mode　of　the　open　thin-walled　flexure　joint.　The　advantages　of　36　degrees　motion　range　and　fixed　rotation　axis　are　presented　in　this　joint.　The　practical　joint　is　made　of　65Mn　spring　steel　according　to　the　designed　joint　geometry.　The　contrast　experiments　between　leaf　spring　and　open　thin-walled　flexure　joints　were　carried　out　on　a　three　DOF　parallel　robot　experiment　platform.　The　results　show　the　designed　open　thin-walled　flexure　joint　can　accomplish　trajectory　tracking　missions　and　the　maximum　relative　error　is　6.05%.　Its　superiority　over　the　leaf　spring　joint　is　presented　by　the　results.