Abstract: To address the flatness deviation of cemented carbide inserts caused by uneven density distribution in green compacts, this study integrates numerical simulation and experimental methods to optimize the pressing process. Analysis based on a two-dimensional axisymmetric model indicates that the synergistic effect of bidirectional synchronous pressing and a 1:1 stroke ratio is the key factor in achieving a symmetric U?shaped density field, which jointly determines the spatial symmetry of the density distribution. A three?dimensional finite element model is further established to simulate the actual insert pressing process. Based on the resulting density distribution, the density evolution and deformation behavior during sintering are derived. The results show that the “low?center, high?edge” density distribution induced by this process naturally evolves into a stable concave morphology after sintering. The prepared inserts are measured with a 3D profilometer, exhibiting a flatness variation of 0.008 to 0.007 mm and the expected concave characteristics, which align closely with the simulation results. The proposed approach can replace traditional trial?and?error methods, significantly improving flatness control accuracy and reducing manufacturing costs, thereby providing a reliable solution for the industrial production of high precision cemented carbide tools.