To ensure flight safety, civil aviation precision approach and landing guidance put forward high requirements for satellite navigation in terms of accuracy, integrity and availability. As satellite navigation equipment, GBAS has special advantages in providing precision approach service. In order to promote the technical application of GBAS in the domestic civil aviation field, based on the GBAS demonstration project of Tianjin airport, the site selection scheme, site analysis and evaluation of GBAS ground equipment in typical domestic airports are discussed.