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The key technology of no-row corn harvester is how to make corn stems being fed effectively. Through analyzing the structure of existing no-row corn harvesters, a new improved project was advanced on the basis of feed-in mechanism with finger rotor, stem-rotor and ear-rotor were installed independently, and the ear-rotor was closed with sweep auger. The stem-rods were straight and the ear-rods were bended, their eccentricity orientations were opposite when they were installed, but they turned in the same direction. As the ear-rotor was moved backwards, the effectiveness of ears delivery was improved, and interference between the stem-rods and the ear-rods was avoided. Change of the stem-rods eccentricity mounting orientation strengthened their ability to transport stems, and increased effectively the range of feeding stem, thereby the adaptability of the harvester to different corn row was improved. By designing the stem motion simulation algorithm, virtual test of the stems motion was completed with the Matlab software, and the movement law of the stems was discussed. Equation of the ear-rod was established, these provided a theoretical basis for the development of prototype.