As an important new part of Airborne Integrated Surveillance System (ISS), Automatic Dependent Surveillance-Broadcast (ADS-B) system shows advantages in surveillance and efficiency under the premise of ensuring flight safety, leading the development of future surveillance technology. By analyzing the development process of airborne ADS-B products and technologies at home and abroad. Then, from the perspective of ensuring flight safety and efficiency, key technologies of ADS-B system are analyzed and summarized. Finally, the development trend of the technology is discussed and prospected by the concept of next generation airspace operation, and 4 future development directions of ADS-B technology are proposed, which provide the development direction for the development of ADS-B technology of airborne ISS. This will promote the development of ADS-B technology in practical operation and theoretical research.