The ground-based augmentation system (GBAS) is a new technology that ICAO focuses on promoting. In order to comprehensively draw on the development and application of GBAS technology in the world, this paper introduces the composition, principle, advantages and disadvantages of GBAS, studies the development of GBAS research and application at home and abroad, and puts forward GBAS application suggestions based on the current operational requirements of Chinese civil aviation, providing a reference for the development and application of GBAS.