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In order to solve the problem of debugging the baseband signal of Beidou navigation system, a zero value test baseband signal source design is proposed. In view of the characteristics of multi signal channel, high signal transmission rate and high precision of clock signal, the high performance FPGA and DSP processor are integrated on the single board. The system adopts modular design, and uses direct digital radio frequency signal transmitting technology and high speed clock system design. The signal source can simulate and output multi-channel multi-channel modulation baseband signal, which can flexibly configure the working parameters and the real-time monitoring of the working state of the device. The experimental results show that the signal source also receives and receives two large signal processing links. The system has the characteristics of strong generality, flexible configuration and good stability, and solves the problem of debugging and processing of the baseband signal in the navigation system.