Abstract: A driven gap disc cutting mechanism for treating corn stalk and rootstalk was developed for no-till drill in the areas of two crops a year. For width of disturbance of soil surface, the angle between the disc plane and its axes is necessary and smaller. By motion analysis and the soil bin experiments of the mechanism, the key parameters were optimized. The rotor speed being 350 r/min, the mechanism has a good ability to cut corn stalk and rootstalk, and the installing angle of the gap disc being 70°, the power consumption is 1.7 kW and the width of disturbance of soil surface is 56.7 mm.