Trehalose exists in mold, algae, dry yeast, ergot, etc., and can also be artificially synthesized. It has the special function of preserving biological vitality, and can effectively protect the structure of cell membrane and protein, so that organisms can keep their cells moist under abnormal conditions, such as high temperature dehydration (drying, high osmotic pressure) and freezing, to prevent the loss of nutrients and cell damage caused by the loss of water. In addition, in vitro trehalose also has the characteristics of stabilizing the structure of biological membrane and protein, which is used internationally to protect genetically engineered enzymes, various viruses Vaccines, antibodies, protein factors, nucleic acids, etc., as stabilizers and protectors of bioactive substances, have broad application prospects in food, health products, cosmetics, medicine, molecular biology, agriculture and other fields.