Fumaric acid is a good growth-promoting agent, which can be used as feed alone. Can Promote the growth of livestock and poultry, but also a kind of anti-mildew agents, preservatives. The addition of organic acid to feed, fumaric acid is a kind of unsaturated fat acid, it can participate in the metabolism of the body, it can also be used as an anti-stress agent in the production of livestock and poultry, the addition of fumaric acid to feed livestock and poultry, fumaric acid can also promote the decrease of gastric PH value, accelerate the activation of pepsin activity, improve digestion and absorption rate, thereby promoting protein absorption, increase appetite.