Ozone, a natural substance existing on the earth, is widely known because of the existence of atmospheric ozone layer. Ozone is a strong oxidant and broad-spectrum and efficient bactericide, which has a unique fishy smell. 1785, when the Germans used the motor, they found that there was an odor when the motor was discharged. 1840, German scientist Schonbein identified this odor as O3 and named it ozone. Since then, European scientists have taken the lead in studying the characteristics and functions of ozone. After discovering the broad-spectrum bactericidal effect, they began to apply it to industrial production. Among them, a Swedish beef company used ozone to keep beef fresh, starting from 1870. /kloc-in the 0/9th century, people realized the strong oxidation of ozone, and found that ozone had oxidation effects on wood, straw, starch, plant pigment, natural rubber, fat, animal and vegetable oil, alcohol and so on. 1868, Degbes obtained the first patent of ozone application technology, which used ozone to oxidize coal tar mixture into products suitable for coatings and paints. 1873, ozone was used in sugar production and flax bleaching in Europe. Over the past 100 years, the application of ozone has penetrated into many fields and made great contributions to the development of human production technology. The application of ozone can be divided into four areas according to its use: water quality treatment, chemical oxidation, food processing and preservation, and medical treatment. Application research and equipment development in various fields have reached a fairly high level. Independent ozone technology industries and departments have been formed in the world, and the International Ozone Association (IOA) established by 1973 is located in Canada. The Association holds an international conference every two years to exchange papers and reports on the development of ozone technology in various countries. In developed countries, IOA regional organizations are generally established for academic exchanges. After World War II, the international ozone application technology has made great progress. First of all, in 1902, the first large-scale water plant using ozone to treat water quality was established in paderborn, Germany, which pioneered the treatment of ozone water. Now there are thousands of ozone water plants in the world, and the application of ozone in waterworks in Europe, America, Japan, Canada and other countries has reached the popularization level. Almost all mineral water and pure water manufacturers are equipped with ozone equipment. In the early 1970s, the United States began to use ozone to treat domestic sewage, the main purpose of which was to sterilize, remove pollutants, decolorize and so on, so as to meet the discharge standards. In Japan, sewage is treated by ozone and used as reclaimed water in water-deficient areas. The United States, Japan, Germany, France and other countries have established large-scale ozone sewage treatment plants in recent years. Secondly, the industrial application of ozone has also been very common, mainly used in chemical, petroleum, paper, textile, pharmaceutical and perfume industries. The application of food industry is more popular. 1904, Europe used ozone to preserve milk, meat products, cheese, protein and other foods. In the late 1930s, 80% of oocyte cryopreservation warehouses in the United States were equipped with ozone generators. After World War II, Europe, the United States and Japan used ozone in the storage, manufacture and transportation of food, fruits and vegetables. In medical treatment, Japan used ozone for physical therapy during World War II, while Russia used ozone for strong air (ozonated air) sports crowd. At present, there are many medical uses in the world, such as air disinfection in wards and operating rooms, ozone water disinfection of medical instruments, ozone treatment of dental diseases (oral surgery and maintaining oral sterility), ozone combined with radiotherapy treatment of cancer, drinking ozone water treatment of gynecological diseases, ozone gas injection treatment of fistula and hemorrhoids, varicose veins and so on. In terms of health care, it is popular in Japan and Taiwan Province Province to inhale strong air (air with low ozone concentration) to strengthen the body and shower the body with ozone water for sterilization and beauty. The popular high-tech beauty is actually the application of ozone. Ozone disinfection technology is a new sanitary disinfection technology introduced into food processing industry in recent years. With the deepening of people's understanding of it, it is gradually applied more and more. The sterilization and disinfection characteristics of ozone gas and ozone water make it have the advantages of replacing the existing ultraviolet and chemical disinfection methods in some food production links. It can also solve the problem that some foods cannot be sterilized by heating, and at the same time reduce energy consumption.