Sialic acid is a kind of natural compound, widely found in bird's nest, seaweed, insects and other organisms. It has a variety of biological activities, such as antioxidant, antibacterial, antiviral, etc., so it has important application value in medicine, food and other fields. In the medical field, Sialic acid can be used as a natural antibacterial agent to prevent and treat bacterial infections. In addition, Sialic acid can also inhibit the replication and spread of the virus, thus playing an antiviral role. Therefore, Sialic acid has an important application prospect in the field of anti-infection. In the food field, Sialic acid can be used as a natural preservative to extend the shelf life of food. In addition, Sialic acid can also enhance the nutritional value of food, improve the taste and nutritional value of food. Therefore, Sialic acid also has important application prospects in the field of food. In short, Sialic acidis a kind of natural compound with wide application prospect. Its application can not only promote the development of medicine, food and other fields, but also bring more well-being to human health and life.