Abstract: A type of high-speed rice transplanter frame was studied in the paper, and the three-dimensional modeling software UG was used for its parametric modeling, then the model was imported to FEA software ANSYS Workbench to analysis the frame. Different experimental conditions were simulated to calculate stress and deformation of the frame, and the stress of the main deformed part was measured. Then the calculated results were compared with experimental data, and the correctness of FEM results was verified. Based on the results of FEA, a frame model of optimal design was established, and one more reasonable lightweight design proposal was made by calculating. Through the optimization and improvement, the weight of the frame decreased by 16.77%, which showed the optimization program was economical and feasibility.