Abstract: In the paper,alfalfa saponins and yeast culture can be used to improve production performance and enhance immunization of animals.The results showed that alfalfa saponins can effectively regulate lipid metabolism,reduce blood cholesterol levels,improve the utilization of dietary nutrients,and enhance the immunologic function,anti-oxidation function and production performance.In addition,the yeast culture also could promote propagation of beneficial bacteria and their activity increased by improving the internal environment and flora structure of gastrointestinal tract.In a word,they can enhance stability of pH in the rumen,immune function and production performance of animals.