2. In 1970s, laser was widely used in clinic, which set off a worldwide laser medical fever. Since the first international conference on laser surgery was held in Israel in 1975, it has been held every two years. Until 1979, the number of delegates attending the conference has increased from 8 for the first time to 100. 1979 In March, the first international symposium on laser medicine was held in Detroit, USA. More than 400 people attended the meeting, representing 16 countries. During this period, on average, more than 70 papers on the clinical application of laser were published every year. The laser photocoagulation machine was successfully developed in 1970 in China. 197 1, Shanghai Sixth People's Hospital published the first clinical report of ruby laser photocoagulation of retina. 1973, otolaryngology hospital affiliated to Shanghai medical university, Zhongshan medical university and other units use domestic CO? The therapeutic instrument has been used in surgery, dermatology, otolaryngology, gynecology and oncology. 1974, a laser endoscope system was developed. From 65438 to 0975, He-Ne laser was used to treat headaches, acute and chronic skin ulcers, hypertension and other diseases. At the same time, he-ne light was used to anesthetize the stomach, thyroid and tooth extraction. 65438-0977, the first national laser medical academic exchange conference was held in Wuhan, and more than 80 papers were read out. By the end of 1970s, China had been able to manufacture 10 kinds of medical lasers, which were used to treat more than 250 diseases and millions of patients. The first international symposium on laser medicine was held in Tokyo from 65438 to 0980. Chinese laser medical workers use laser photodynamic therapy to treat tumors with the largest number of cases, and are in a leading position in the application of laser needle and clinical application of dye laser.