The function of the fruit net sleeve is in the late growth period. The mechanism is that almost all fruits are affected by the invasion of birds, the harm of pests and the damage of wind and rain, and the difference of the quality of the harvest when they are close to maturity. In this case, the traditional way is to spray pesticide, not only the effect is bad, but also the traditional way is to spray the pesticide. It also caused pollution to the natural environment and harmed human health. Even so, about 30% of the fruit was damaged before harvest. Fruit bagging can solve these problems, because the fruit in the bag will not be encroach on the bird, will not be infected by the fruit fly bacteria. In the process of growth, it will not be scraped by the branches of the tree and avoid direct sunlight, and the air permeability of the bag itself can produce individual greenhouse effect, so that the fruit can be properly wet. Temperature and temperature increase fruit sweetness, improve fruit luster, increase fruit yield and shorten its growth period. At the same time, because the growth process does not require pesticide application, the fruit is high quality and pollution-free, and achieves international standards.