Beidou satellite navigation system is a global satellite navigation system independently developed by China. Its origin can be traced back to the late 1970s, when China decided to carry out research on satellite navigation technology. At first, China borrowed from the GPS system of the United States, but for strategic security reasons, the United States restricted the use of GPS in the military field, which inspired China's determination to independently develop satellite navigation systems. China began to develop its own satellite navigation system and started the Beidou project in 1994. The project has gone through several development stages, including implementation stage, test and verification stage and operation and service stage. After years of efforts, China successfully launched the first Beidou navigation test satellite in 2000, marking the beginning of the Beidou project. The core idea of Beidou satellite navigation system is to realize China's autonomous navigation and positioning ability, reduce dependence on external navigation systems such as GPS, and ensure national security and development needs. Through continuous innovation and technological progress, China has successfully built the Beidou satellite navigation system with global coverage, multi-system compatibility and high-precision positioning capability, providing accurate and reliable navigation services for various fields.