To self-develop half-feed peanut picker,the composition and working principle of the picker,the configuration mode of the picking roller,picking movement process and the structural parameters of the picking plate was introduced.The reasonable structure and parameters of picking roller and picking plate was confirmed by theory and experiment.Using peanut breakage rate,unpicking rate,impurity rate,and total loss rate as the index,the configuration mode of picking roller,structure and parameters of picking plate was studied.Results showed that when the picking roller was the intersection and parallel configuration,the breakage rate and impurity rate were the maximum.When the picking roller was the tangent and parallel configuration,the unpicking rate was the maximum and the impurity rate was the minimum.When picking roller was the tangent and parallel configuration or gradually tight angle configuration,the breakage rate was lower.The unpicking rate of the arc plate was a little higher than that of the straight board plate and bend plate.The bigger the rotational speed of the picking roller,the greater the breakage rate and impurity rate to the straight board plate,bend plate.The radian of the plate obviously affected the breakage rate and impurity rate.The smaller the radian,the higher the breakage rate and the lower the unpicking rate.When the plate radian is 70 ° and the arc radius is 35 mm,the total loss rate is the minimum.By theoretical analysis and picking performance test,the tilt configuration method is adopted on picking roller to clamping chain.The gradually tight type angle configuration method is adopted between the double picking rollers.The picking plate is adopted in the backward-arc type with the plate radian of 70 ° and the arc radius of 35 mm.