Pepper blight belongs to soil-borne diseases, and germs mainly spread by irrigation. From July to September, it is the peak period of the chillies disease. Heavy rain and stormy weather and flooding during the summer can cause rapid and rapid spread of the disease, causing large areas of pepper to die. 1, using plastic film covering high ridge cultivation. Plastic film mulching in early spring can increase ground temperature, early emergence, promote early growth and robust seedlings, improve plant disease resistance; high ridge (15-20 centimeters) can avoid water accumulation in roots and cause epidemics. 2, using a small shed or greenhouse nursery transplanting. Small shed or greenhouse seedlings are easy to manage meticulously, nurturing strong seedlings, and enhancing disease resistance of plants. At the same time, in the seed treatment process, seed soaking can be prevented through warm scalding and seed sterilization; transplanting can improve land utilization. 3, combined with irrigation, irrigation and prevention. Before spraying or before rain, uniformly apply 1.5--2.5 kg of copper sulphate powder per acre on the ground, and then irrigate small water; or dissolve copper sulfate crystals in water and pour water into the fields at the outlet. The watering should not exceed 2/3 of the ridge height, and should not be flooded with water. The best watering time is in the morning. 4, foliar spray control. Before spraying or after the rain, spray with 50% Siobacter 1000 times or 800-1000 times with green copper milk. The effect is very good. It can also be controlled by 50% amethyol 500 times liquid, 64% arsenic poisonous copper 250 times liquid, etc.