According to the experiment conducted by Zhang Gecheng from the Citrus Institute of the Chinese Academy of Agricultural Sciences in Luzhou, Sichuan: For the 14-year-old lychee trees that bloom every year but rarely bear fruit, spray 0.15% natural brassin EC at the initial stage of the first and second physiological fruit drops ( Yiwu Huangjia Biochemical Co., Ltd.) each time, the 8 treated trees all produced 15.6 to 34.2 kg, and the 12 untreated control trees produced only 6 fruits, with an average yield of 4.42 kg. The yield of the treated tree was 329.86% higher than that of the control tree. According to laboratory analysis, the processed fruit has a weight gain of 5.5 g and a seed kernel weight of 0.16 g lighter than the control, and some of it is a scorched kernel. The edible rate increased by 5.85 percentage points. The effect is very significant.