According to the characteristics of airport’s seasonal passenger transport volume, this paper presents a predictive method on it, of which the basic idea is: firstly, calculate the average seasonal index and make amendment according to the moving average of the historical statistics of airport’s seasonal passenger transport volume; then construct a trend model on it; and finally construct a demand analyzing model on airline’s seasonal passenger transportation. As the simulation result show, this method is feasible and highly accurate. It can be applied as an effective tool to predict airport’s seasonal passenger transport volume.