Nowadays reducing weight of products especially for the products that cause environmental pollution such as vehicles is not only an option, but also an obligation. This project has focused on the early design phase of a justify; LINE-HEIGHT: 142%; TEXT-INDENT: 14.2pt; MARGIN: 0cm 0cm 0pt; unicode-bidi: embed; DIRECTION: ltr; mso-pagination: widow-orphan" In the current work, the objective of the design of justify; LINE-HEIGHT: 142%; MARGIN: 0cm 0cm 0pt; unicode-bidi: embed; DIRECTION: ltr; mso-pagination: widow-orphan" After investigating the results of topological optimization, a concept is presented for the chassis and the structure. In this project, CATIA and ABAQUS software are widely used. CATIA has been used in the field of CAD. Finite element method is used for static analysis and is used to determine the strength and rigidity of the chassis and the vehicle structure subjected to the required loads. The key of static analysis is to ensure that loads are reasonable and they are in the standard limits. The loads on body and structure are very complex and have different modes; but mostly torsion and bending are important. ABAQUS has been used to calculate the strength and stiffness in both bending and torsion load cases. Finally, the weak points of the chassis are identified and appropriate solutions for strengthening of them are presented. The final design of chassis has proper structural properties even though it has low weight. Keywords; Topology Optimization, mini vehicle, Automotive chassis design, finite element analysis