Abstract: A method of a new spinning forming method for thin-walled parts with elliptical cross-section was proposed, which was based on the movement principle of the mechanical swing arc guide rod. An image analysis method was used to establish the mathematical model of the forming principle and the forming trajectory of the thin-walled elliptical section and a numerical calculation method was used to verify the accuracy of the model. Based on this model to study the movement relationship between the wheel and the parts during the forming process and to select different sizes of gyration radius of the wheel. The trajectory of the wheel during the forming process of the thin-walled elliptical section was simulated, which derived that it was conducive to the forming of elliptical cross-section parts when the radius of rotation of the wheel was closer to its lower limit provides a theoretical basis for the subsequent general process research and application of related cross-sections and machine tool development.