Since the birth of Watson and Crick’s DNA double helix model, biology has entered a new era. In the biological world, DNA is required, and the central law is required. The extraction of DNA has become the field of biomedicine and even agriculture, forestry, animal husbandry and fishery. The foundation of scientific research in all disciplines. With the rapid development of genetic diagnosis, genetically modified food testing, personalized medicine, etc., the current nucleic acid extraction technology is no longer able to meet the needs of today's biotechnology, and there is an urgent need for a high-throughput and automated nucleic acid extraction method. . In this context, the magnetic bead method for nucleic acid extraction came into being.