Abstract: In agriculture, food and pharmaceutical industries, particle coating is a common process, and coated seeds are often used in carrot mechanized sowing. Therefore, understanding the physical parameters of the coated seeds is very important for the design and optimization of the planter. For this, it is necessary to analyze the movement characteristics of the particles. Researchers usually use the discrete element method to simulate particle motion. The discrete element method is a reliable analysis method, but its accuracy depends on the particle discrete element parameters used in the simulation. The particle discrete element parameters are generally difficult to obtain directly,which need to be calibrated. What this article needs to calibrate is the discrete element parameters of coated carrot seeds. Refer to the parameter calibration process of corn, wheat and other seeds, take the pile angle of repose as the response value, use different parameter combinations to simulate, and compare with the test results to find the optimal parameters, is a discrete element parameter calibration method based on stacking test. Firstly, the Plackett-Burman test is used to test the significance of the discrete element parameters of the coated carrot seeds, and the factors that have a significant impact on the response value are screened out; then the optimal level range of the significance factors is determined according to the steepest climbing test;finally, a three-factor five-level quadratic orthogonal rotating combination test is used to find the best parameter combination and compare and verify through simulation and experiment. The three parameters, namely the static friction coefficient between carrot seeds and carrot seeds, the static friction coefficient between carrot seeds and aluminum plate, and the rolling friction coefficient between carrot seeds and carrot seeds, have significant effects on the angle of repose. The best combination of discrete element parameters is: static friction coefficient between carrot seeds and carrot seeds The coefficient of friction between carrot seeds and aluminum plate is 0. 42, and the coefficient of friction between carrot seeds and carrot seeds is 0. 08. The calibrated parameters are used for simulation, and the average angle of repose is 18. 13°. Compared with the experiment, the relative error is 1. 06%, which shows that the optimal parameter combination is reliable and can be used in the subsequent discrete element simulation of coated carrot seed, which provides a reference for the design of precision seed metering device.