The key technologies of low⁃altitude aircraft navigation are introduced, encompassing fundamental navigation techniques and comprehensive augmentation methodologies. A thorough analysis is conducted regarding the present state of navigation system testing technologies, with particular emphasis on the categorization and evaluation of various testing methodologies for critical navigation parameters. These include position⁃velocity measurement, heading determination, attitude assessment, and verification approaches for integrated enhancement technologies. It is pointed out that the test technology faces the deficiency in verification capabilities in two aspects: adaptability to complex scenarios and anti⁃interference ability, the lag between standardization and supervision, and the contradiction between test cost and scale, and it presents the trends of intelligence, standardization and globalization, scenario diversification, low⁃carbon and sustainability, which provides a reference for the further development of low⁃altitude aircraft navigation system test technology.