Silage film is a kind of functional film which helps to keep the nutrients of grass, corn, grain and vegetable and prevent them from oxidation. Under anaerobic condition, after 3-6 weeks, the biochemical process of natural lactic acid fermentation was completed. After fermentation, the crude protein content of straw bales increased, the PH value decreased, and the soluble total sugar content increased, the feed intake rate of livestock is high.

As the most advanced package of silage in the world, forage silage film has been widely used in Europe, and Australia.