Based on the action principle of continuous wave Doppler Radio fuze, the hardware-in-the-loop simulation system is designed. Will test the role of the fuze Doppler signal which the fuze generated will be collected by using precision operational amplifier OPA378, after its adjustment to the processor, the processor will collect the signal to AD conversion, and upload to the host computer, the received dopple signal waveform is displayed, to stop after the threshold accepted. Finally, the experimental results show that the system can simulate the CW Doppler airfuse fuze.