Generally, robust 1 ~ 2-year-old branch layering is selected from the end of May to June. The base of the annual branches should be cut off and buried in the soil to keep the soil moist and promote the germination of new roots. Cutting planting in the autumn of the following year. Or about 10 day after flowering, when the shoots are semi-lignified, the second or third leaf at the base is annularly peeled off at the axil of 0.5 ~ 1 cm, and the width is about 1.5 cm. The rooting rate can reach above 70% when absorbent cotton is dipped in 50 mg/kg indole butyric acid solution to wrap the girdling mouth and then pressed by high branches. The next autumn, the mother plant was cut off.