In this paper,the performance of hybrid Free Space Optical/Radio Frequence (FSO/RF) airborne communication system based on selection combining (SC) diversity is analyzed.The system is simple in design and does not require channel state information (CSI) at the transmitting end.The FSO link is modeled by the Exponentiated Weibull distribution and the RF link experiences the Nakagami-m fading.For the hybrid FSO/RF airborne communication system,we derive closed form expressions for the cumulative distribution function(CDF) of the signal-to-noise ratio at the receiving end.The closed expressions of the outage probability(OP) and the average bit error rate(BER) are further deduced in terms of Meijer′s G function.The effects of different turbulence intensity,modulation mode and diversity communication scheme on the OP performance and the BER performance are analyzed by simulation.The simulation results show that the hybrid FSO/RF airborne communication system has better BER performance and OP performance than the single FSO system and the single RF system.Using BPSK modulation can effectively reduce the impact of atmospheric turbulence on hybrid FSO/RF airborne communication system.When the signal-to-noise ratio is high,the communication scheme of parallel transmission and diversity reception improves the BER performance of the system better than the low-order modulation.