1. Tree pruning should adjust the tree shape, balance the tree potential, adjust the ventilation and light transmission of trees and the distribution of fertilizer and water, and adjust the relationship between plant communities to promote the vigorous growth of trees. The pruning of trees and shrubs in all kinds of green spaces is mainly natural trees.

2. Trees: mainly pruning long branches, pests and diseases, cross branches, combined branches, drooping branches, sprained branches, dead branches and rotten heads.

3. Shrubs: Shrubs should be trimmed to make the branches and leaves lush and evenly distributed. Pruning should follow the principle of "from top to bottom, from inside to outside, from weak to strong, from old to new".

4. Hedges: Hedges should be trimmed to promote their branches and keep the whole branch full. Prune the flower balls once in spring and once in autumn.

5. Ground cover and climbing plants: Pruning ground cover and climbing plants should promote branching, accelerate covering and climbing functions, and turn vines once a year for perennial climbing plants to remove dead branches.

6. When trimming, the incision should depend on the section, and the incision should be smooth. For large branches that are too thick, the method of cutting by sections should be adopted, and attention should be paid to safety during operation.

7. Dormancy pruning is mainly plastic, and can be slightly pruned; Pruning during the growth period is mainly to adjust the tree potential, so pruning should be light. Trees with bleeding should be pruned in summer and autumn.