Calcium butyrate can resolve 2 molcule butyric acid, butyric acid provides energy to the intestinalepithelial cells quickly of the whole intestine. Butyric acid is a kind of short-fat acids and a main energy provider for intestinal epithelial cells. It can drastically stimulate the growth of intestinal epithelial cells and increase the length of intestinal villus to guarantee the normal migration of intestinal epithelial cells and facilitate nutrition absorption, strengthen immunity and improve animal health and thus overcome the weaning stress syndrome, raise production performance and reduce mortality rate.