20?min左右。To improve plow design efficiency, the parametric design and knowledge base technology were applied. Based on the plow twelve-parameter mathematical model and plow surface composition curve equation, the plow curve equation and the plow care equation were derivated. The knowledgebase was introduced into the plow parametric design to express the expert experiments and design experiments, which were necessary to the plow parametric design. A case of plow parametric design system showed that the developed software system only needs three parameters: farming width, depth and speed, the 2D and 3D engineering drawings of the plow can be created automatically, and design period is shorted from several months to about twenty minutes. 