The previous Beidou anti-jamming down-conversion channel is mainly using amplifier, mixer, filter, frequency synthesizer and other chips for circuit design. The kind of design needs the designer to be familiar with many kinds of Radio Frequency (RF) circuit design and the adjustment experience. The design has a high level of difficulty ,and the debugging workload is also substantial. In the paper, a down-conversion frequency channel design and implementation method based on Beidou anti-interference RF chip is studied. The scheme has the advantages of simple design, RF miniaturization, low power consumption, and flexible gain adjustment. Through circuit design, software design, channel simulation and physical test, the rationality of design scheme is verified.