Nowadays the methods and procedures for optimization of the mechanical structures are integrated in CAD and FEM software. Implementation of optimization algorithms in design process helps the designer to find the best shape that can fulfill the mechanical requirements without involving additional calculation, time and specialized personal. This study shows the necessary steps to find the optimal shape of the bracket used to rigidize the car bodywork, by using the topographic optimization method. The base geometry is modeled in Solidworks CAD environment. The midsurface of this geometry is extracted and meshed into shell finite elements using Hypermesh software. The assigned material properties and load case creation are done after the establishing the design and nondesign space and the objective functions. The finite element model is run in Optistruct solver. The obtained frequencies for six-vibration mode are analyzed between the initial and optimized model.  The best-resulted geometry is generated with the manufacturing purpose. The end of this paper highlight the advantages of using optimization in automotive design engineering.