Abstract:In order to further improve the rigidity of the arm of SCARA robot and achieve the purpose of lightening the structure of the arm, based on the study of the structure of lightweight and highstiffness biological organisms, Stiffened plate bionic structure of arm of SCARA manipulator plate was designed by Pro/E ,and ANSYS Workbench was used to carry out static analysis and modal analysis on the arm,then the optimal bionic stiffened plate II model was obtained. The simulation results show that specific stiffness efficiency and first order natural frequency of the mixed bionics structure based on stems and veins is improved, and the static and dynamic performance are also improved.Then,based on the relationship between repeated positioning accuracy,absolute positioning accuracy and arm stiffness,the experimental results show that the dynamic and static perfoemance of the bionic stiffened plate II model is improved.