First, the general principle of greenhouse nectarine warming before the winter general principle of cutting is the long tip pruning, the result is not short-cut long branches, mainly to thin branches, reasonable results to stay branches, make full use of indoor space results. For the saplings colonized in that year, 10-15 shoots were selected for each plant, and then 30--40 shoots were selected for each plant as the case may be. The results should be uniform distribution of the branches, without affecting each other's growth results, and to make full use of the light. Second, when the branches are pruned, the following branches shall be removed. 1, no flowers or flowering results of poor quality branches. Such branches not only have very low fruit setting rates or even no results, but also affect the light in the interior of the tree and compete with the result branches for fat, water, and glory. 2. Shoots damaged by pests. The purpose of removing the branches damaged by pests and diseases is to reduce the incidence of diseases and insects, reduce the incidence of diseases and insect pests, and improve fruit yield and quality. 3, too dense branches. Under the premise of leaving sufficient branches, the dense branches of the trees should be properly removed, so that the distribution of the results can be uniform and reasonable, and the ventilation and light transmission conditions can be improved. In general, the branches with stronger growth tend to be removed, leaving the result of the mediocre branch. 4, remove the upper part of the excessively thick Wang branch. There are three main aspects of the impact of the overly thick branches on the tree. First, the shading is severe, affecting the growth and results of the lower and middle result branches; secondly, the branching tendency is unstable and the fruit setting rate is low; and thirdly, the top of the peach tree grows strong and the upper branches are too thick, which can easily cause strong trees. Weak, resulting in poor fruit development in the lower middle, affecting the yield and quality. 5. Overlapping and competing branches. Overlapping branches compete with each other, affecting light, causing canopy closure, decreasing effective leaf area, decreasing fruit setting rate, unbalanced tree growth, and lower fruit production and quality. 6, the lower part of the invalid branch. This type of shoot has poor flower bud maturity and cannot produce results. In order to enhance the lower ventilation and light transmission, it should also be removed. Third, pay attention to the following points in the thinning should pay attention to. 1. The upper part is sparse and the lower part is sparse, so as to control the strong and weak, and form a more reasonable spindle-shaped tree structure. 2. The secondary branches with good maturity and good flower buds can be properly retained. To increase the result area and increase production. 3. When the height of the tree is not enough, choose a more upright branch from the top as the center leader, cut in the middle as a prolonged head, and timely pick up the heart when reaching the height requirements, and prompt the new shoot. 4. Spray 1 time sterilizer after trimming, such as Baume 5 degree lime sulfur, “9281” 100--150 times liquid, and Solipol 100--150 times liquid, etc., in order to prevent clippings from being infected by bacteria.