To enhance the seismic safety of airport engineering structures, it is important to study the effect of airport high-fill site on earthquake ground motion parameters. A three-dimensional numerical analysis model of an airport high-fill site using the time-domain analysis method is developed, and the site boundary effects is considered by using infinite elements method. Considering the influence factors such as the location of the high-fill site, the height of the high-fill site and the amplitude of the earthquake ground motion, the characteristics of the earthquake ground motion parameters of the high-fill site of the airport are analyzed by using the PGA dynamic amplification coefficient as the index. The results indicate that the earthquake ground motion effect of the high-fill site amplifies with increasing vertical height, peaking at the site surface, and its amplification effect should not be neglected. Meanwhile, the PGA dynamic amplification coefficient varies with input earthquake waves, for instance, the PGA amplification coefficients of the site surface under natural wave 1 and natural wave 2 are 2.48 and 2.05, respectively. Furthermore, high-fill sites effectively filter high-frequency components of input ground motion, with filtering intensity increasing along the vertical height, such as 46.7%, 96.1% and 97.3% of components below 2 Hz in natural wave 1 and when transmitted to the bottom and surface of the site, respectively. With the increase of high-fill height, the amplification of the PGA dynamic amplification coefficient on the surface of the high-fill site firstly increases and then decreases, such as the PGA dynamic amplification coefficients are 2.24, 2.48 and 2.29 for fill heights of 30m, 40m and 50m respectively under the natural wave 1 action. Compared with frequent earthquake and fortification earthquake, the ground motion amplification effect of the airport high -fill site under rare earthquakes is reduced.