Abstract—Cartesian robot with triple-speed truss can achieve the function that was grabbed tire from an assembly line and completed tire vertical stacking of storage. This paper was mainly focused on the design and parameter optimization of triple-speed truss robot-arm. The virtual prototype of Cartesian robot was built by Solidworks software. Using of finite element analysis software ANSYS Workbench, key parts and robot in the system were static analyzed and modal analyzed so that product was designed to meet the strength and stiffness requirements.