Choline chloride is currently the most commonly used and most economical form of choline, which is mainly used as additives to be mixed into animal feed. In the use of choline chloride, in addition to preventing its moisture absorption and deliquescence, it should also be noted that all feeds have been adding choline chloride as the last process, because it has a destructive effect on other vitamins, especially metals. When the elements are present, they will destroy vitamins A, D, and K quickly. Therefore, choline should not be added to multi-dimensional preparations. The compound feed after adding choline chloride should be used as soon as possible.