With the development of scientific and technological advancement in agricultural production, the proportion of chemical herbicides suitable for agricultural land use in pesticides is increasing, the area of ​​chemical herbicides applied to farmland is becoming wider and wider, and the dependence of farmers on chemical herbicides is increasing. The stronger it comes. The application of chemical herbicides has brought many advantages to agricultural production, such as reducing the labor intensity of farmers, effectively controlling the growth of farmland weeds, and increasing crop yields. However, problems that arise in practical applications cannot be ignored. In recent years, the following problems have appeared in the use of farm chemical herbicides: 1. Phytotoxicity: Phytotoxicity caused by the use of chemical herbicides in crops is quite common. After investigation, the main causes of crop injury are: (1) Herbicide drift caused damage to non-target crops. This problem is most prominent in soil-closed herbicides in wheat fields. During this period, due to the concentration of herbicides used in farmland, the concentration of active ingredients of herbicides in the air was too high, or the chemicals drifted with the wind when spraying, causing other non-target sensitive crops to suffer damage. (2) Damage caused by residual crops caused by herbicides. For example, wheat and rice fields use residual herbicides (methyl methasulfuron, chlorsulfuron and their combinations) to cause damage to the crops. The farmers often do not know enough about this, and it is difficult to take timely and effective methods to rescue them. (3) Herbicides cause damage to target crops due to improper use. If the application amount is too large, pesticide application at the sensitive stage of the crop, smoke spray, etc. can produce phytotoxicity to the crop. 2. Pharmacodynamics: First, the efficacy of the drug is slow. Some herbicides (such as sulfonylurea herbicides) do not show efficacy until one month after use, and they are used on short-season crops. Once they are found to have poor efficacy, it is difficult to make up for them. The second is that the drug is unstable and affected by the environment. For example, the use of pre-winter herbicides in wheat is affected by temperature, and the influence of low temperature on the spread of pesticides; soil closed rape field treatment, affected by soil moisture is relatively large, and drought often results in poor fruit application. At the same time, the age of grass is also one of the factors that affect the efficacy of the drug. Generally, the greater the age of the grass, the worse the effect. Third, the spectrum of herbicides is narrow, and single and dicotyledonous weeds are difficult to achieve. 3, Resistance: With the extension of herbicide use time, the problem of weed resistance will become more and more prominent. Due to the long time spent on herbicides in China, a long-term continuous use of herbicides, coupled with farmers' inaccurate use of the concentration and application period, can easily cause resistance to weeds and cause changes in weed communities. 4. Others: In addition to the above problems, herbicides have problems such as short application period, single application method, and incompatibility between product use and technology. Herbicides are a class of pesticide products with high technical content. With the development of agricultural modernization, the application of herbicides will be more and more widespread. In view of the problems occurring in the use of herbicides, it is recommended that future development and application should focus on Grasp the following aspects: The first is to increase scientific research investment in the development of herbicides, develop new varieties and new formulations suitable for different regions and different crops, enrich the types of herbicides, extend the use period, and improve the weeding effect. The second is to gradually solve the hazards of herbicides in the soil and airborne drift, and improve the safety of herbicides. Thirdly, the application of herbicides should be strengthened. The selection of herbicides suitable for local use, the development and utilization of herbicides and the combination of mature use technologies can minimize the problems arising from improper use of herbicides. The fourth is to strengthen the management of pesticides, do a good job of trials and demonstrations, and avoid the blind introduction of new varieties. 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