In order to improve the efficiency of product design, the component framework technology was studied. With the help of CATIA secondary development platform, the variant design of typical aircraft parts was realized on the basis of parametric modeling technology, the feature information was extracted quickly, and the intelligent operation was realized. By using object-oriented programming language, a variant design module integrated with CATIA system is developed to improve the design efficiency of typical aircraft parts. Taking the tie rod in the typical aircraft parts as an example, the verification of the variation design method shows that using CATIA secondary development technology and CAA programming tools, the parametric modeling of typical aircraft parts can be achieved to achieve the variation design.