Abstract: This paper analyzes the transfer characteristic of the mobile communication channel on nearby space, including multipath fading, shadow effect and Doppler effect. On the basis of GWSSUS model, it proposes near space communications model of the channel. According to the state of flight, long-distance, short-range and over the top models are respectively built up. The bit error rate of the three flight states are simulated. Simulation results show that the model is able to reflect a more realistic approach of space communication channel characteristics.