GNSS has been widely used in civil aviation and provides positioning, navigation and timing sources for PBN and ADS-B technologies. The performance of GNSS space signals is critical to the safe operation of civil aviation. According to the relevant regulations of the ICAO, monitoring and evaluating the service performance of GNSS signals is a necessary condition for using GNSS elements. The current situation of GNSS service performance monitoring and evaluation at home and abroad is analyzed, expounds the future development trend of the system, and puts forward suggestions on domestic research and practice in related fields.