With the rapid development of global satellite navigation technology, the Ground-Based Augmentation System (GBAS), as a next-generation navigation technology, has demonstrated significant advantages in improving airport operational efficiency and ensuring flight safety. Taking Lhasa Gonggar International Airport as an example, this paper systematically elaborates on the basic principles of GBAS, the site selection methods for ground stations, and performance evaluation. By analyzing the impact of ionospheric activities on GBAS service performance and evaluating system accuracy, integrity, and availability using Stanford diagrams, the applicability of GBAS in high-altitude and low-latitude regions is verified. The research results indicate that ionospheric activities in the Lhasa Gonggar Airport area are relatively stable, and the GBAS system meets the operational requirements for Category I precision approaches in terms of vertical accuracy, integrity, and availability. This study provides important references for the application of GBAS in plateau airports and contributes to the promotion of satellite-based navigation technology in the field of civil aviation in China..