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The pests on garden cotton are mainly red bollworms, red spiders, aphids, thrips, and blind sting bugs. They usually overwinter on dead branches, fallen leaves, bells, and weeds left in the cotton fields. Thorough removal of dead branches, fallen leaves, bells, and eradication of weeds around cotton fields can effectively eliminate the above-mentioned overwintering pests. Concentrate the scavenging materials in a timely manner to burn or bury the fertilizer. Deep-turning soil, cotton bollworm, ground tiger, Spodoptera litura, bridge-building insects, etc. in the soil in the winter, can be implemented to turn soil to kill. Turning soil can also increase soil permeability, accelerate soil maturation, and increase soil fertility. The depth of earth turning is 30-40 cm, the topsoil is turned to the bottom, and the subsoil is turned to the top. The large earth-turned pieces do not break, allowing them to weather naturally in winter. Irrigation and killing of insecticides on the basis of earth turning can kill a large number of overwintering pests in the soil. According to the experiment, after the soil is poured and poured, the mortality rate of overwintering bollworms in the soil can reach more than 90%. Irrigation should be carried out on the 39th day. It should be filled with water, and the irrigation volume per mu is generally 80-120 cubic meters. Fill some of the clay land with a little more land. The irrigation method is suitable for furrow irrigation, so that the water is slowly immersed in the chamber, avoid flood irrigation, irrigation can also enhance the water storage capacity of the soil.