Abscisic acid (ABA) is a kind of hydroxide. Under the action of enzymes in the plant, it is prone to dehydration reactions. It has the role of inhibiting plant cell division and growth, dormant, forming an iconic, accelerating the aging and falling of the leaves and organs. It can promote the accumulation of seeds and fruits, especially storage protein and sugar. Applying acid in the early days of seeds and fruit development can achieve the purpose of improving food crops and fruit tree output.