Satellite-based navigation technology has been applied and popularized more and more in the civil aviation industry. GBAS, which is the enhancement of Global Navigation Satellite System (GNSS), as one of the indispensable means for Satellite-based Radio Navigation System providing precision approach have been widely concerned. As with the Ground-based Radio Navigation System, GBAS needs to be tested and validated before use and opening. The composition and working principle of GBAS are presented. According to the requirements of the international civil aviation organization, the functional testing of GBAS before use is reviewed, and the parameters of the measurement are analyzed in detail. The GBAS ground testing methods of functional requirement are given and the accuracy of GBAS is introduced in detail, and the technical reference for the operation of GBAS in the domestic is provided.