When the hypersonic aircraft re-enters the ground, due to the uneven distribution of the plasma electron density on the surface of the aircraft, the transmission from the leeward side to the space-based relay satellite can avoid the high electron density on the windward side, using the Q/V band waves as the communication band, the signal is forwarded to the ground communication station through the relay satellite. Based on the wave impedance method, this paper analyzes the transmission characteristics of the Q/V band under different plasma parameters and simulates the effect of the plasma on the antenna beam pointing in the Q/V band. The results show that the Q/V band has better penetration in the plasma and can maintain a lower attenuation value at higher plasma electron density and collision frequency. However, the antenna beam pointing deviation in the Q/V frequency band is relatively large, and the deviation value gradually decreases with the increase of the frequency band and the decrease of the incident angle. Therefore, using the Q/V band to realize real-time communication through relay satellite forwarding is conducive to alleviating the "blackout" phenomenon of re-entry aircraft.