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First, the pruning of fruit trees. After entering the full fruit period, with the increase of yield, the tree tends to weaken year by year. At this stage, the pruning should handle the proportion of the branches at all levels, and control the tree potential to be strong in the mean. The result is that the branches account for the total amount of the total trees. % - 50%. Results The amount of mother branches should be determined according to species, site conditions, tree potential, etc. Generally, the hills will be 8 to 12 per square metre, depending on the projected area of ​​the crown, and 12 to 16 riverbank flats, with no more than 18 at most. In the pruning, attention should be paid to removing the over-prosperous and weaker results of the mother branches, and retaining the mediocre ones. Perennial branching branches other than long branching, thin branches, and branches are retractable each year, so that the small control of groundlessness is controlled, and the retraction to the branching point of the perennial branch is usually performed, which promotes the bud initiation. The treatment must be light and heavy, there is control and training, and priority should be given to retracting the light legs, overlapping, and overlapping perennial fostering branches. After the treatment, the growth of branches was strengthened, and the light of the canopy was improved to form a wavy crown to achieve a three-dimensional result. Second, the "small old tree" transformation pruning. After chestnuts are replaced with good ones, the results can generally be achieved in two years. As long as the tree grows and results, nutrient consumption is high and the tree body is easily debilitated. In particular, some units only pay attention to the management of improved varieties, and do not pay attention to pruning and other management, it is easy to form a "little old tree." The pruning of such trees must be carried out on the basis of strengthening the management of fertilizers and waters. The first is more sparse shearing, and the second is minor retraction to rejuvenate the tree. If the severe dead limbs are too weak, they can be trimmed to a heavier degree in the year to renew and renew the branches. The remaining branches will be weak and strong, and the single branches will be extended. The whole tree will be rejuvenated in 1-2 years. .