Aiming at the practical problems of airport site selection evaluation of mobile auxiliary communication unmanned aerial vehicle (UAV), combined with the distribution of natural disasters that may require communication support such as earthquake, rainstorm, snowstorm, typhoon and flood in China, the establishment of airport site selection evaluation system of mobile auxiliary communication UAV is proposed. In view of the problems existing in the traditional fuzzy analytic hierarchy process (FAHP), some improvement measures are taken to overcome them, such as constructing multiple fuzzy judgment matrices, consistency processing of weights of criterion levels, and normalization method of trapezoidal distribution function. The evaluation results show that the method is feasible and effective.