In food processing, as a food additive, isolate soy protein can play a complementary role in amino acids and is a functional food. It can improve people’s health and has a high digestibility and utilization rate. When mixed with other foods, it can significantly improve the nutritional value of the original food. It can completely replace animal protein. The content of 8 kinds of amino acids is relatively close to the needs of human body. Methionine is slightly insufficient. It is similar to meat, fish, eggs, milk, etc. It is a full-price protein and has no side effects of animal protein, such as induction. Obesity, cardiovascular disease, hypercholesterolemia and other diseases are a good source of human protein, and it is safe and reliable and contains fewer microorganisms.