In order to provide the suggestion and reference for the reasonable design and rapid manufacture of the model in the national structural design competition, taking the first prize structure in the structure design competition in 2015 of Shandong Province as an example, through the joint application of structural mechanics solver, CAD3D,ANSYS and other software, based on the structure selection, structure analysis and structural actual manufacturing to discuss on the application of computer aided design in design and manufacture of structure design competition. In addition, the experimental results show that prestressing can significantly increase the stiffness of the structure and reduce the deformation, which is beneficial to improve the model's competitiveness.