Pruning 1, plum trees often adopt natural open shape and double-layer evacuation open shape. The naturally open heart has the characteristics of ventilation and light transmission, high fruiting rate of inner cavity and lower branches, long service life and easy management. Double-layer open-heart tree structure, the first layer has three main branches with a spacing of about 80 cm, and the second layer has two main branches, which are happy when they fall on their heads.