The previous Beidou Anti-Jamming Down-conversion channel is mainly using amplifier, mixer, filter, frequency synthesizer and other chips for circuit design. This kind of design needs the designer to be familiar with many kinds of RF circuit design and the adjustment experience, the design difficulty is big, the debugging workload is also big. In this paper, a down-conversion frequency channel design and implementation method based on Beidou anti-interference Rf chip is studied. Through circuit design, software design, channel simulation and physical test, the rationality of design scheme is verified.