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Aiming at the non-uniform roadbed structure of alternate filling and excavation in mountainous airports, the semi-analytical Finite Element method is used to establish a dynamic interaction model of aircraft-pavement structure-road foundation, and under different working conditions of the mountain airports, the results of the additional dynamic stress of the road foundation soil under the single-wheel dynamic load of the aircraft during the plane taxiing along the runway at a constant speed are solved and analyzed. The results show that when the slope ratio is 1∶2, the vertical dynamic stress and shear dynamic stress of the soil element gradually increase with the observation point close to the interface, and the stress extreme value appears at the position -2m away from the interface, which can reach 1.4 and 1.3 times of the corresponding depth of the uniform subgrade. The vertical dynamic stress and shear dynamic stress at different depths increase with the increase of aircraft speed or the increase of the stiffness of the fill area. With the slope ratio smaller, the vertical dynamic stress shows an increasing trend and the shear dynamic stress shows a decreasing trend. The stress extreme values appears location becomes more far from the interface. [ABSTRACT FROM AUTHOR]