1. Adjust the environmental conditions of orchard groups: by shaping and trimming, the crown can have a certain volume and form a good shape and structure, making full use of space and light and heat resources; Proper control of canopy spacing, row spacing, crown height, space under the canopy and the total amount of leaf curtains can maintain good ventilation and light transmission conditions for orchard groups;
2. Adjust the balance of all parts of the tree: moderate pruning (including removing flower buds and fruits) of retaining strong branches and buds on local branches can stimulate the vigorous growth of the branches; However, leaving weak branches and weak buds (including more flower buds and fruits) or excessive strong cutting on local branches can weaken the growth of the branch and control the growth, so as to achieve the balance of growth between branches;
3. Maintain good nutritional status of fruit trees: shaping and pruning can control the excessive growth of leaf area, make branches and leaves evenly distributed, with large, thick and dark leaves, high nutritional level of leaves, good light receiving conditions and strong photosynthesis; The removal of excessive flowers and fruits, and the removal of weak and ineffective branches and leaves can improve the nutrition supply conditions for retaining branches and leaves, so that fruit trees can maintain good growth and nutrition under the condition of poor fertilizer and water;
4. Regulate the relationship between growth and fruit;
5. Regulate the distribution of nutrients and promote the growth and fruiting of fruit trees.