Abstract: Wind load is the main load that the radar antenna structure of large vehicle-borne radar withstands. The wind-resistant stability is directly related to the safety of the whole structure and is a key factor which determines the success of the overall design. No effective analysis method has been formed for such problems in radar structure design. Methods usually adopted such as torque law method, multi-body dynamics method and iterative method based on linear problems all have some limitations. In this paper, the stability of a large domestic vehicle-borne radar is investigated, and a set of nonlinear finite element analysis methods based on multi-contact algorithm are established to overcome the limitations of existing analysis methods. By reasonable simplification of the vehicle-borne structure and detailed simulation of the boundary conditions of multi-supporting legs, the wind-resistant mechanical response of the large vehicle-borne radar is obtained. The correlation of the contact forces, rising displacements of supporting legs and the gravity center of radar antenna with the direction and magnitude of wind force is studied for the first time. The results provide certain theoretical basis and design guidance for the wind-resistant stability design of large vehicle-borne radars.