Focus on the actual project development of ADS-B airborne receiving component, the technology of ADS-B IN is studied in this paper, the general technical scheme design of ADS-B IN is indicated. The hardware and software solution of radio frequency receiving front-end and digital processing back-end is given, based on the standards of RTCA DO-260B, the enhanced algorithm for extended massages is indicated, and the laboratory tests and actual environment testing methods and results are given.