Rumen acidosis is a severe digestive system disorder which causes a great harm to the health and production performance of food-producing animals.After entering the rumen,probiotics can stabilize the ruminal pH value by maintaining the balance of the microbial community in the rumen.In addition,probiotics can bring its immune function back to normal by stimulating the body,and alleviate the symptoms caused by acidosis.The current state-of-the-art of knowledge about gastric acidosis is reviewed in this paper.