When the tractor is working with the disc plow, the plow body enters the soil under its own weight and hydraulic pressure. Since the disc surface is at a certain angle to the forward direction and the vertical plane, under the action of traction power and soil reaction (or forced driving), the disc rotates around its own axis or disc axis, and the disc rotates with Sliding cutting, tearing, twisting and stretching work together on the soil. The soil is cut and moved, rises along the surface of the disk, and is turned over with the assistance of the scraper. Rely on the tail wheel to balance the reaction force of the soil when working.