When the airplane is tied-down at high wind velocity, it will be subjected to the large loads. So the carrying capacity of mooring structures and mooring cables should be analyzed, and the calculation of tie-down loads becomes very important. The software of MSC.Nastran is used to establish the nonlinear static model by the application of nonlinear gap elements, in which the one-way bearing characteristics of mooring cables, the nonlinear contact characteristics of landing gear with the ground and the influence of the shock absorber loads on tie-down loads are took into account. Then the tension of mooring cables and the loads at mooring points are calculated. The finite element analysis provides a new method for calculation of the tie-down loads.