Guo Liang is a kind of brassinolide with high efficiency and quick effect. Compared with ordinary brassinolide, it has the advantages of quick-acting and long-acting because of its two high efficiency, and overcomes the shortcoming of single action mode of ordinary brassinolide. Guo Liang is the most active 28- epibrassinolide in the world at present, which belongs to high-activity super-concentrated brassinolide, and its efficacy is more than 50 times that of ordinary brassinolide 0.0 1. 100 ml water, 1000 kg, flower protection and fruit protection, 1. Citrus is used in the early flowering stage to promote more flowering; 2. It is used in the fruit protection period to reduce the concentration of abscisic acid and prevent the fruit stalks from falling off, thus achieving the effect of fruit protection; 3. Used in young fruit stage, it can promote the division and expansion of fruit cells, form large fruits and reduce fruit cracking.