Abstract: Due to the lack of harvesters for corn-soybean strip intercropping in southwest of China and problem of low efficiency and high-damage in the harvest-time,a two-row low-damage corn harvester header with narrow row spacing was designed based on Computer Aided Design and Finite Element Method.Using the principle of elastic buffering,the header can complete the operation of picking corn with low damage and crushing straw and returning to the field at one time.According to the agronomic requirements of corn-soybean strip intercropping and principles of mechanics,the basic structural parameters of header was determined,and then the key components of the header was designed and analyzed theoretically.The results of modal analysis showed that the frame of header would not resonate with the engine.The rotation speed of the snapping knife rolls,the feeding speed,the corn loss rate and the corn breakage rate influenced by the distance between the corn and picking plate were explored through quadratic regression orthogonal experiment.The experiment results showed that lowest loss rate of corn occured at the rotation speed of the snapping knife rolls of 800 r·min^-1,feeding speed of 0.700 m·s^-1,the distance between corn and corn picking board of 370 mm where the corn loss rate was 0.03%and the corn breakage rate was 0.01%,which could meet the requirements of mechanized corn harvesting under corn-soybean strip intercropping model.