Small molecular peptides were extracted from soybean protein using directed enzyme digestion technology and advanced membrane separation technology. Compared with soy protein, soy peptides are more easily absorbed by the human body and do not increase the burden of digestive organs. The protein content is more than 90%, and the 8 amino acids necessary for the human body are complete. Soybean peptide has good nutritional properties and is a promising functional food raw material， used as finished oral liquid, functional food raw materials