On this day, 35 years ago, on July 21, 1990 (May 29, 1990, the Chinese Lunar Calendar), the Beijing Electron-Positron Collider officially passed the acceptance inspection. Electron beam transport line of the Beijing Electron-Positron Collider On July 21, 1990, the Beijing Electron-Positron Collider project officially passed national acceptance. This national key project with an investment of 240 million yuan was laid and broke ground in 1984 by Deng Xiaoping personally. In October 1988, electron-positron collision was achieved. This is another major breakthrough achievement made by my country in the high-tech field following the successful explosion of atomic bombs and hydrogen bombs and the launch of artificial satellites. The completion and successful collision of the electron-positron collider has opened up broad prospects for China's applied research on particle physics and synchrotron radiation. In 1984, my country began to build an electron-positron collider in Beijing. After four years of design, construction and debugging, it has begun to operate. The energy of the Beijing Electron-Positron Collider is 2.8 billion electron volts. Dr. Lee Zhengdao, Nobel Prize winner, world-renowned physicist and Chinese American, believes that the engineering speed, quality, installation and debugging level of various equipment and components of the Beijing Electron-Positron Collider are first-class in the world.