Abstract: The link outage in the ground spacecraft wireless test caused by the micro-Doppler frequency shift is studied in this paper. Firstly, the mechanism of its influence on the amplitude and the frequency of the received signal due to the Doppler frequency shift in a wireless test circumstance is analyzed, and it is shown that a very small Doppler frequency shift can lead to a distortion of the received signal, and cause the outage of the test link. Then, the space antenna diversity technology is proposed to improve the transmit quality of a wireless test link under a micro-Doppler frequency shift. Finally, the computer simulation verifies the effect of the Doppler frequency shift on test signals.