Amide selective, pre bud herbicide can be used in corn, cotton, soybean, peanut, rape, potato, sugarcane, sesame, sunflower and legume, Cruciferae, Solanaceae, Compositae, Umbelliferae and other vegetable fields and orchards to prevent annual grass weeds, and one application of medicine can control the whole growth period of the crop without weeds. It is not effective for perennial weeds.