Butachlor is a selective pre bud herbicide with amide absorption and conduction. The pure product is a light yellow oily liquid with a slight aromatic flavor. It is insoluble in water and soluble in many organic solvents. Its chemical properties are stable at room temperature, neutral and weak alkaline conditions. Under strong acid condition, it will accelerate its decomposition and can be degraded in soil. It is low toxic to human and livestock, irritating to skin and eyes, and high toxic to fish. It was mainly absorbed by the young buds of weeds, followed by the roots. After absorbing butachlor, plants can inhibit and destroy protease in vivo, affect the formation of protein, inhibit the normal growth and development of young buds and roots of weeds, and make weeds die.