Choline chloride was developed by the Agricultural Technology Institute of the Ministry of Agriculture, Forestry and Fisheries of Japan in 1964, and registered as a plant growth regulator in 1987. It also became vitamin B4. Common choline chlorides on the market are divided into plant-carrier choline chloride and white carbon black (silicon dioxide) as a carrier choline chloride. my country’s production is about 400,000 tons, accounting for more than 50% of the global production capacity. Choline chloride is not choline, but a salt of choline cation (cholinecation; CA+) and chloride ion (Cl-). Real choline should be an organic base composed of choline cation (CA+) and hydroxyl (OH), which exists naturally in many plants. Simply put, 1.15g of choline chloride is equivalent to 1g of choline. It has been registered as a sweet potato rooting agent and tuber enlarger in Japan, and is widely used in fruit crops.