Abstract: Alfalfa is a kind of perennial herb, and as a favorable fodder resource, the ensiled alfalfa plays an important role in easing up the shortage of fodder and regulating the supply and demand of the green feeding stuff. But because of its high buffer energy and low content of soluble carbohydrate, it＇s difficult to get the good effect by mixing alfalfa directly. At present, many researches have focused on using additive to obtain good ensiled alfalfa fodder. The relative researches and applying conditions of alfalfa silage additives at home and abroad in recent years were summarized, and the research trend in the future was looked forward.