Soybean peptides were prepared from defatted soybean meal by enzymatic method. The fragment of 12- 13 peptide in the mixture has similar structure and function to endorphin, which can reduce people's appetite. Soybean peptide has many regulatory functions on the body, and it plays a significant role in promoting fat metabolism, losing weight, lowering cholesterol and enhancing muscle exercise ability. Some scholars have confirmed that soybean protein can reduce plasma low-density lipoprotein and increase high-density lipoprotein, and soybean protein can reduce blood lipid in people with hypercholesterolemia and type II hyperlipoproteinemia. Japan and the United States have been widely used in foods to lose weight and enhance exercise endurance. Animal experiments show that soybean peptide has the functions of anti-fatigue, reducing blood lipid, controlling the weight of rats and inhibiting the damage of lipid oxidation to cell liposome membrane. The swimming exercise load test of mice such as Ishihara in Japan found that soybean peptide can increase the exercise endurance of mice and reduce abdominal fat. It shows that soybean peptide has the function of losing weight and improving exercise ability. Qi Teng and others' research on rats confirmed that soybean peptide can increase the metabolism of adipose tissue and reduce the storage of fat in the body. Feeding soybean peptide to obese children can reduce subcutaneous fat, increase energy metabolism and heat production, which may be related to the improvement of basal metabolism. The above work at home and abroad fully confirmed the importance of soybean peptide in reducing weight and blood lipid.