1. Pruning should follow the principle of "removing dense and keeping sparse, removing weak and keeping strong, leaving more strong branches and less weak branches".

2. Young tree pruning: Young tree pruning is mainly to carry out short-cut shaping treatment, combined with delaying branches and pulling branches to carry out tree body shaping.

3. Pruning of trees in fruiting period: Pruning of trees in fruiting period should focus on thinning out branches of diseases and pests, weak branches, dead branches and cross branches in tree holes.