1, leaving 3-4 basic branches as the main branches in clusters and extending obliquely in different directions. The main branch bears lateral branches, which bear vegetative branches and fruiting mother branches. The whole tree forms a natural happiness tree with a height of 3 ~ 5m. Trunk pruning procedure: the first year: planting 1 year-old seedlings, the seedlings themselves often do not have three basic branches, so the trunk should be pruned again, leaving about 20cm of stem to promote the germination of basic branches, and the main branches should be selected in the second year. In the second year: select 3 ~ 4 basic branches in different directions as main branches, lightly cut short, leave 2/3 branches, leave full buds and lateral buds at the cut, and cut the rest from the base. The third year: lightly cut the selected main branches and lengthen the branches. Choose 2 ~ 3 lateral branches for each main branch, and lightly cut the short branches. Form a heart-shaped crown, and the branches from the ground to 40cm high on the main branches are cut off from the base. Pay attention to remove sprouted branches in time. The fourth year: continue to cut the extended branches of the main side branches at all levels, and pay attention to cutting the branches and sprouting branches below 40cm. Make the crown continue to expand, and the crown has basically formed.

2. The trunk shape is simple. This kind of tree should keep the trunk height of 40~60cm, and choose 3 ~ 4 evenly distributed main branches on the trunk, with lateral branches and secondary lateral branches on the main branches, and bear mother branches. Form a short trunk with a natural happy crown at the top. Simple trunk shaping and pruning procedures. First year: plant 1 year-old seedlings, immediately fix the trunk after planting, with the height of 60 ~ 70 cm, and keep the trunk height of 40 ~ 60~70cm, and the trunk should be vertical. The second year: select 3 ~ 4 main branches in different directions on the trunk, lightly cut each main branch, about 1/3 of the branch length, and cut off and leave full lateral buds. In the third year, select 2 ~ 3 lateral branches on each main branch, lightly cut the extended branches of each main branch, cut off the outer buds, and do not cut off the short branches in the inner cavity. The fourth year: the extension branches of the main branches and side branches will continue to become lighter and shorter, and the crown will basically form.

3. Multi-stem cluster This crown shape is to select 5 ~ 8 basic branches as the main branches, and the rest are cut off from the base. If the number of basic branches is less than the number of main branches, you can choose from sprouting branches. After selecting the main branch, cultivate the mother branch and the vegetative branch. This kind of tree has too many main branches and unreasonable nutrition distribution, so it is rarely used now.