The first is the pruning of trees in the full fruit period. After entering the full fruit period, the tree potential has a trend of weakening year by year. When pruning in this period, the proportion of branches at all levels should be properly handled and the tree potential should be controlled at a moderate level. When pruning, attention should be paid to thinning out the overgrowth and weak fruiting mother branches, and retaining the medium-level mother branches. After treatment, the growth of branches is strengthened, the illumination of crown is improved, and a wavy crown is formed to achieve a three-dimensional effect.

Second, the transformation and pruning of "small old trees". Chestnut can bear fruit in two years, because it consumes a lot of nutrients and the tree is easy to weaken. Pruning such trees must be carried out on the basis of strengthening fertilizer and water management. One is to reduce the thickness, and the other is to update and shrink less. After pruning, the wound is coated with "anti-corrosion film" to promote the growth of wound healing tissue, isolate pollution, prevent pests and diseases from overwintering and reproduce, and be energetic in the coming year.