In order to reasonably optimize the structure of key components of corn precision seeder,prolong the service life of the machine and reduce the maintenance cost,the key component of the support disc in the seed releaser was designed with its parameters and dimensions,and its static characteristics,inherent frequency and vibration characteristics were analyzed by the finite element method. With the natural frequencies of the first two modes of the support disc as the index,the three.factor and three.level orthogonal tests were carried out with the diameter of the outer edge of the support disc,the overall thickness of the support disc and the thickness of the outer edge as the factors. The final analysis shows that the optimized minimum inherent frequency is 52. 456 Hz,which is greater than the external excitation frequency range of 1-33 Hz,and the optimized maximum amplitude is reduced from 5. 847 3 mm to 3. 685 9 mm,which reasonably avoids the resonance interference,the trial prototype is subjected to bench fatigue test,and the average service life of the support disk is 213 h,which meets the standard requirements. It provides theoretical reference for the optimization of life extension and cost reduction of key components of the seeding machine.