With regard to the possible world science and technology hot events in 2023, many international mainstream media have made an outlook, including the China Space Station Engineering Sky Survey Telescope ("CSST" in English for short), and believe that its flight will become a new annual milestone for human exploration or use of space with the launch of new rockets and the launch of asteroid mining missions by the United States. According to the latest version of China's space white paper, after the Tiangong Space Station is fully completed, China will launch and deploy CSST in due time to carry out more extensive astronomical surveys. The China Manned Space Engineering Office has said to the outside world that China's first large space telescope for sky survey is planned to be launched in 2023 to carry out wide-area sky survey observation, and will carry out advanced scientific research in the formation and evolution of the cosmic structure, dark matter and dark energy, extrasolar planets and solar system objects. When it comes to astronomical telescopes, the rising star in the field of space optical observation, many people may first think of the "China Sky Eye", namely the 500 meter aperture spherical telescope (FAST) in Pingtang, Guizhou. As a major scientific and technological infrastructure built in China in recent years, FAST has gained high popularity with its huge size, excellent exploration ability and rich initial exploration results, and is renowned at home and abroad. Compared with FAST, CSST is not so well-known at present, but for industry insiders, it is a rising star in the field of astronomical observation with optical telescopes. In addition to their different popularity, FAST and CSST also have many differences, of which the most fundamental difference is that they belong to different types of astronomical telescopes. FAST is a radio telescope that receives radio waves from celestial bodies, and the giant spherical mirror is its antenna for receiving radio waves. It collects weak cosmic radio signals and then transmits them to the receiving system for amplification. The receiving system separates useful signals from the noise and transmits them to the back-end computer for recording. The results recorded by the computer are shown as many curves for astronomers to study and analyze, thus obtaining various cosmic information. Because radio waves can penetrate the space, radio telescopes are not likely to be affected by light and climate, and can work all day and without interruption. CSST is an optical telescope, which captures the near-ultraviolet to visible light band. Through the large diameter, long focal length objective lens and small diameter, short focal length eyepiece of the telescope, it can realize the near imaging of distant objects. In this way, people can observe distant celestial bodies through optical telescopes. Due to the influence of the earth's dense atmosphere, ionosphere, ozone layer and geomagnetic field, the observation ability of ground-based optical telescope is limited. With the progress of space science and technology, the space optical telescope to eliminate the influence of the above factors came into being, namely the Hubble Space Telescope and the Weber Space Telescope, which were launched in April 1990 and December 2021 respectively. The China Sky Survey Space Telescope will follow closely and become the new "flying giant eye" of mankind. It is divided into two parts. With five major equipment, the CSST will be a huge space vehicle