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Aiming at the problem of high kernel breakage rate in the mechanical threshing process of fresh corn in China, on the basis of the existing threshing device structure, a “flexible gyroscopic roller + axial drum reducer threshing” combination of flexible reducer threshing device was designed to achieve high efficiency threshing. On the basis of the mechanical characteristics of fresh corn cob,，the design concept of package cutting was adopted to establish a mechanical model of cob and carry out theoretical analysis, and finite element simulation analysis was carried out for the core threshing parts of the fresh corn thresher to determine the main factors affecting the threshing performance.According to the theoretical analysis and simulation results, the threshing prototype was designed,，the threshing performance test was carried out. Design-Expert software was used to design a threefactor, five-level quadratic regression orthogonal rotary combination test, with drum speed, gyro roller speed and rotor axis distance as the test factors, and grain breakage rate and cob failure rate as the test indexes. The results showed that the biggest influence factor on the grain breakage rate was the axis distance of the rotary axis, and the biggest influence factor on the maize ear uncleaned rate was the drum rotational speed;according to the regression equation model, the optimal conditions were predicted as follows：drum rotational speed was 106.630 r/min, gyro roller rotational speed was 230.001 r/min, and rotary axis distance was 54.00 mm. The verification test was carried out according to the actual working conditions under the optimal conditions. After three parallel tests, the actual kernel breakage rate was （4.956±0.152）% , and the cob not stripped rate was （4.158±0.085）%, which was within 5% of the predicted kernel breakage rate of 5.033% and cob not stripped rate of 4.303%, which was basically in line with the optimization of the parameters and met the requirements of fresh corn threshing. The research result can provide technical support for the optimal design and selection of fresh corn threshing equipment.