Abstract: In order to solve the technical problems caused by the large soil content, the difficult root-tuber-soil separation and other problems during the harvesting of cyperus edulis, the large working resistance and the serious deformation of the cutter shaft, a discrete element model of the root system of cyperus edulis was established, a EDEM simulation, analysis rotary blade in different parameter combinations work cyperus esculentus aggregate state of rupture, rotary blade at a rotational speed, forward speed, deep tillage experimental factors to rotary blade knife digging resistance and axle torque test index, orthogonal test data analyzed by Design-Expert 8. 0. 6, optimum operating parameters rotary blade,blade shaft speed of 250r/min, a forward velocity of 0. 8m/s, deep tillage It is 118mm. According to the optimized results, the virtual simulation verification test is carried out, and the optimal results are obtained: the working resistance is 3378. 05N, the torque of the cutter shaft is 32. 638N·m, which provides a theoretical basis for the actual field test of the sago pea harvester.