In this research, the numerical simulation of the cushion process of the exhausting airbag in the landing system of the large airborne equipment was conducted. Based on the finite element method, the finite element model of landing cushion system was established. Using the control volume method, the dynamic analytical software LS-DYNA was adopted to simulate the airbag cushion process and obtain the changing patterns of the airbag parameters such as the internal airbag pressure, the residual airbag height and the velocity of air exhausting, then the influencing rules were analyzed of the changes of main parameters (elastic modulus of the airbag weaving, exhaust pressure, exhaust port area) on the cushioning property of the airbag. The research results showed that the exhaust pressure and the exhaust port area had greater influence on the airbag cushioning property. When the elastic modulus of the airbag fabrics was higher than 0.2 GPa, less effect of elastic modulus on the airbag cushioning property was observed. The results of the study can provide reference on airbag initial design and simulation of the airbag cushion process for the engineering personnel.