Dual-clutch transmission and double-turbine torque converter’s flexible flywheel is the newly developed type which has applied the design of a two-body flexplate. Corresponding 3D modeling of this new type of flywheel has been constructed by virtue of the software Pro/Engineer. Further comparative analysis has been studied in terms of structural stress, modal, and harmonic by the finite element software ANSYS Workbench, Through all these studies, the simulation results show that two-body flexible is a kind of the structure has a better performance. On this basis, the shape of the flexplate in the flywheel has been optimized with different flexibility to meet the requirement of dynamic characteristics, the test verifies the correctness of analytical approach and the rationality of product structure. A feasible design and practical analytical approach has been brought up through this study.