Abstract: With the research and development of hypersonic vehicles technology, the issues of ionization blackout have become increasing prominent during hypersonic flight. And there is the superiority of millimeter wave atmospheric window in atmospheric transmission. According to the data provided by radio attenuation measurement C (RAM C) voyage experiment, double-exponential distribution, Epstein distribution and Gaussian distribution models of plasma sheath were established. The principle of interaction between atmospheric window of millimeter wave and plasma was analyzed through Z-FDTD algorithm, getting the attenuation properties of atmospheric window of millimeter wave propagation in plasma sheath. The analysis by synthesis shows that the 35 GHz, the window of atmosphere in Ka waveband can be selected as communication waveband used in near space main communication platform, and subsidiary of 220 GHz in terahertz waveband airspace-based communication platform. It will carry on the real-time measurement and control when the reentering vehicles and hypersonic aerocraft voyage in the near space.