When the sapling grows to a certain height, leave 2 to 3 main branches so that they are staggered up and down. Every year after the leaves fall in autumn or before budding in early spring, short-cut each main branch and cut off about 1/3 of the total length. Prune the tips of strong branches lightly, and prune the tips of weak branches heavily. In daily management, excessively dense new branches, crowded branches, and useless branches should be pruned. Short-cut or thin out strong competing branches in the canopy. Remove tillers and top in time.