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In order to produce high-quality, high-yield pollution-free vegetables in greenhouses, the author has summarized the following measures in many years of practice: First, the selection of disease-resistant varieties in addition to high yield, but also should be particularly selected varieties with strong disease resistance. Such as cucumber's "Jinyou No. 2", tomato's "Lishen No. 8", eggplant's "Purple Eggplant" and so on. Second, increase the application of agricultural fertilizer and phosphorus potash fertilizer future shed basal fertilizer should be based on agricultural fertilizer, generally 100 meters long shed 15 to 20 cubic meters of fertilizer each year, in the production period and then according to the need to apply nitrogen, phosphorus, potash, to full-scale application. Third, the use of automatic subsurface dark infiltration irrigation in the shed within the use of automatic subsurface irrigation, there is no water evaporation on the ground, greatly reducing the humidity within the greenhouse, you can control a variety of diseases and insect pests caused by high humidity. Underground infiltration, simple equipment, low cost, generally every 100 meters long shed, one installation cost is 1,000 yuan, available for ten years. IV. Controlling the occurrence of diseases with increasing temperature and humidity and high-temperature drainage and irrigation After the temperature exceeds 30 degrees at noon, the ventilation openings are opened, moisture is quickly discharged from the shed, and the air is evacuated in the afternoon to dry overnight, and the unfavorable bacteria multiply. It is an effective measure to control the occurrence of diseases. Fifth, the use of grafted seedlings to enhance disease resistance cucumber, eggplant grafted cultivation can improve disease resistance. In particular, it has an ideal control effect against orange wilt (cuckoo dead) and verticillium wilt of eggplant. Sixth, high ridge and large row spacing cultivation of cucumber can be 0.3 meters high ridge, spacing 1 meter single row spacing. The eggplant can use ridge height of 0.9 meters, one meter double row spacing, reduce the ridge top humidity, increase ground temperature, increase ventilation and light transmission, reduce plant damage caused by human management, reduce germ invasion, can reduce the incidence of disease. Seven, timely and appropriate amount of foliar dressing in general fruit and vegetable production period, with 15 kilograms of water to add urea and potassium dihydrogen phosphate 50 grams, 6-7 days after mixing evenly sprayed leaves, can receive very good disease resistance. Eight, high-temperature stuffy shed sterilization high temperature stuffy shed is commonly used in cucumber downy mildew and black spot disease. Water should be poured before the dwelling, and the ditch temperature is 45 degrees. After 5 to 7 days of high-temperature stuffy sheds, it can be carried out once more. After every 10-15 days, it can also well control the occurrence of diseases. 9. Soil Disinfection and Sterile Sterilization In the hot season of July-August, when there is no vegetable in the shed, lime and straw are used to mix the shed soil to kill the soil-borne pathogen. For pathogens attached to sheds, scaffolds, walls, and floors, before the planting (without crops in the shed), for every 100m long shed, 2kg of sulphur powder is used, and a dry amount of dry sawdust is used, divided into 4 groups. - 5 piles ignited, and 24 hours after the shed is closed, colonize or grow seedlings after 7 days of release. X. Sterilization of smoke from drugs When it is found that a disease has occurred in a meal, drug fumigation can be used to control it. Currently widely used are chlorothalonil, sulfasulfuron, azidein, nemesis, bacterial spirit, dichlorvos and other smoke agents. These smokes are bactericidal and insecticidal, and there are no drug residues on the dishes.