With the change of planting density, there must be a suitable tree shape and pruning method. Practice has proved that it is more suitable to use double-layer flat-headed trees with three main branches at the base and 660 ~ 1 10 crown trees per hectare.

Structural characteristics of (1) double-layer flat-headed tree.

The stem is 35 ~ 40 cm high, the tree is 2.5 ~ 3 meters high and the crown is 2.5 ~ 3 meters. The whole tree is divided into two layers with the spacing of 100 ~ 120 cm. There are 5 ~ 6 main branches, 3 ~ 4 in the first layer and 2 in the second layer. The tree has the characteristics of fast forming, early fruiting, short crown, easy management, large illumination area, good ventilation and light transmission, and simple pruning technology. Suitable for plant spacing of 3m× 4m and 3m× 5m. (2) Crown shape in evacuation stratification.

The crown shape of the evacuation layer is based on the evacuation layer shape with three main branches at the base used in the pruning of the original apple pear in Yanbian area, combined with the current planting density structure characteristics of apple pear trees: the stem height is 35 ~ 40cm, there are six main branches, which are divided into three layers, and the ratio of main branches is 3∶2∶ 1. There are 3 ~ 4 lateral branches on each main branch. The height of the tree is 3.5 ~ 4 meters. The spacing of the first layer is 100 ~ 120cm, and the spacing of the second layer is 60 ~ 80cm. The crown width is 3.5 ~ 4 meters. The tree has obvious hierarchical structure, good ventilation and light transmission, few main branches, fast forming, short tree body and convenient management. Suitable for plant spacing of 4m× 5m and 5m× 5m.