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Software radio is a definition of the design idea of using a fixed hardware platform to implement some or all of the functions of the communication physical layer by loading various application software, and has the characteristics of selecting different types of software to implement different functions. According to the requirements of software radio technology, this paper designs a processing mode based on "ADC+FPGA+DAC", sends the result to the host through the communication interface, and converts the analog signal into digital signal for processing by the host, which is compared with the traditional signal processing mode. Compared with this model, it has the advantages of small size, low power consumption, configurability and programmable, and has a wide application prospect. At the same time, this mode also has a variety of additional functions, such as generating an intermediate frequency signal (IF), digital down conversion, and synchronous solution. The tuning function expands the host interface that communicates with the host computer.