1. Adjust the environmental conditions of the orchard population: through shaping and pruning, the crown can have a certain volume, form a good shape and structure, and make full use of space and light and heat resources; Proper control of crown spacing, row spacing, crown height, crown spacing and the total number of leaves can maintain good ventilation and light transmission conditions for orchard groups;

2. Adjust the balance of each part of the tree: leave strong branches and strong buds on local branches and trim them moderately (including thinning flower buds and fruits), which can stimulate the vigorous growth of branches; However, leaving weak branches and buds (including many flower buds and fruits) or excessive pruning can weaken the growth of branches and control the growth, thus achieving the balance of growth among branches;

3. Keep the fruit trees in a good nutritional state: plastic pruning can control the excessive growth of leaf area, make the branches and leaves evenly distributed, and the leaves are large, thick and dark in color, with high nutritional level, good light receiving conditions and strong photosynthesis; Removing excessive flowers and fruits and thinning weak and ineffective branches and leaves can improve the nutrient supply conditions of reserved branches and leaves, so that fruit trees can maintain good growth and nutrition under the condition of poor fertilizer and water;

4. Adjust the relationship between growth and results;

5. Adjust the distribution of nutrients to promote the growth and fruiting of fruit trees.